“Waiting in the Summer” “Ano Natsu de Matteru.” (あの夏で待ってる。)

Despite the combined efforts of Tetsurō, Mio, Kanna, Remon (and the van-turned-robot and support from the Men in Black), and even Rinon (with a weapon provided by Emika); and even after seeing the desired location, which Kaito is able to see due to the nanomachines he got from Ichika, the proof they were looking for—a love umbrella carved into a tree by the alien who crash-landed on the place a long time ago—is gone, and the Federation recovery team takes Ichika away. But as a result of such encounter, the memories of the aliens about the distant time when they did arrive at the place were unlocked and become part of the memory for all those involved. As the new school term enters, Kaito’s sister Nanami returns from her trip to Bolivia with a gift for Ichika (a traditional incan vest); Kaito tells her that Ichika’s term abroad ended and she went back home. Remon, prior to transferring back to the MIB, leaves Kaito and the others an incomplete version of the film they have made. A few years later, Kaito, Mio, Tetsurō, and Kanna have graduated, but not without completing the unfinished film. During a re-showing at the school festival, Ichika (wearing Nanami’s gift) is seen appearing in it.

“Don’t Leave, Senpai” “Ikanaide, Senpai.” (行かないで、先輩。)

Emika is retrieving Ichika because the latter is on a planet where contact with its lifeforms is forbidden under their Federation laws, and the only solution is for her to leave this planet before things get messier. Ichika reluctantly agrees, but changes her mind when Kanna and the others arrive to stop her. Learning certain information from Emika, Remon tells them that Ichika may stay if the earthly spot Ichika has seen in her imagination is found in order to prove a probable previous contact between aliens and human beings. As the group finds the place, the search team arrives and starts a pursuit. Since Rinon’s teleport function becomes disabled, Remon takes the others to the spot using a van specially prepared with Emika’s help; with Tetsurō, Mio, and Kanna becoming bio-signature decoys for the pursuing rescue craft. However, a few kilometers from the site, the van collides with a cloaked drone from the rescue craft and overturns.

“Senpai’s and ours” “Senpai to Bokura no.” (先輩と僕らの。)

As Ichika and Kaito spend some time close together (which Ichika credits to Kanna), a depressed Kanna shuts herself in her room after a visit from Tetsurō, who tells everyone that she has a cold. He meets Mio on the way, where they shared the cake she was to give Kanna. There Mio asks and hears his reason why he invited Ichika to do the film with them. Angry at himself, Tetsurō kicks a nearby wooden railing and injures himself. The next day Tetsurō invites Kanna to their old playground as kindergarten kids and confesses to her, but she rejects him; and as she runs off to Kaito’s place to confess (only to be rejected by Kaito anyway), Tetsurō falls on his knees, where Mio sneaks from behind and hugs him, saying it’s alright to cry. The filming of the movie continues, but one day Emika, Ichika’s older sister, appears.

“Senpai” “Senpai” (せんぱい)

After the incident involving the rescue drone Ichika reveals her true identity to Kaito and the gang, and reveals her true intentions on Earth, namely “looking for that place in her memory.” Kaito, however, isn’t surprised because he already knows the fact. However, with the rather rough “rescue attempt” by the Federation rescue drone, she believes that another will come to investigate, and fears that her days on Earth are numbered; thus shunning Kaito for a while—and sealing her feelings for him. This irritated Kanna, telling Ichika that “looking for that place” is just an excuse to avoid him. Kanna confessed that she has feelings for Kaito, and runs away after confronting Ichika—only to be consoled later by Tetsurō, hurting Mio in the process. Kaito, with a bit of encouragement from Remon, did confess to Ichika later—and, when Kaito said it’s his first kiss, she revealed that she has kissed Kaito four times already, as she gave him the fifth one.

“Senpai in Trouble” “Senpai ga Pinch,” (先輩がPinch,)

After Ichika enjoys her first Japanese festival, Remon pops out of nowhere to challenge everyone to a test of courage at a dark shrine. During the test Rinon appears to Ichika, telling that an emergency beacon has been activated. True enough, a Federation lifeboat (a rescue drone) comes to rescue her (it’s more of taking her by force), but Ichika refuses, saying she has still a lot to do. Then again, when Kaito hears Ichika scream, he rushed to where she is, abandoning his partner Kanna. Even with the help of Rinna, one of Ichika’s machines, Kaito dies rescuing “the one he loves.” Ichika, however, manages to reverse Kaito’s death. Kaito awakens and sees himself with Ichika inside a ball of light, and mysteriously returning to the same spot. Everyone catches up to the two and sees Ichika incessantly apologizing in front of Kaito.

“Senpai’s Feelings” “Senpai no Kimochi.” (先輩の気持ち。)

Ichika’s worries are banished when she gets to the root of what’s going on with Kaori and Kaito; while Mio does her best to protect Tetsurō from a ravenous Chiharu—to a point of revealing a secret. The group wrapped up their filming the next day, as Kaori and Chiharu leaves for the airport right after filming.

“Senpai’s Rival” “Senpai ni Raibaru.” (先輩にライバル。)

As Ichika is pondering on what Tetsurō told Kaito that night, thanks to Tetsurō’s sister, filming for their movie goes to Okinawa, where Kaito meets a childhood friend, and her companion is attracted to Tetsurō. This puts Kanna and Ichika at an unease, especially when Kaori, the girl, says that Kaito is her fiance. Mio, on the other hand, is uneasy herself when Chiharu, Kaori’s companion, sets her sights on Tetsurō.

“Senpai Is a Heroine” “Senpai wa Hiroin.” (先輩はヒロイン。)

Ichika becomes the heroine of the independent film the gang were planning before summer break. Kaito agrees, while helping Ichika look for that particular place she is looking for. Kanna becomes uneasy when the lines for the film becomes somewhat uncannily realistic, especially in the scenes involving Kaito and Ichika. Even Kaito was surprised by Ichika’s questions that evening. As the next day was a rainy one and filming is cancelled, Kanna goes to Kaito’s house to bring some nozawana. That evening, Tetsurō, after meeting an uneasy home-bound Kanna, sneaks into Kaito’s room. He tells him that she, his childhood friend, is in love with him. Ichika overhears the conversation.

“Senpai Was Amazing” “Senpai wa Sugokatta.” (先輩はすごかった。)

Things turn awkward the next day, but they try to put it behind them. More complications arrive when Manami, Tetsurō’s married sister, takes Kaito shopping. Ichika sees them, and follows them via teleportation with Rinon’s help, even to Manami’s apartment. Worried about what will happen next, Ichika enters and tries to take him home, though not without clashing a bit with Manami. Tetsurō arrives and clears things up, telling Ichika that Manami is already married, and she is here because of a petty quarrel with her husband. As an apology, Ichika asked Kaito if she could do anything for him. He asked if she could help him review for the finals, to which she agreed, and helped him study until the final day of exams.

“Senpai Says…” “Senpai ga Icchau…” (先輩が言っちゃう…)

Kaito seems to be frustrated with his failed attempt to confess to Ichika, so he decides to ditch school, telling her to leave him alone for a while. Worried, Kanna goes to visit him at his house. Her visit turned into a date as the two went to Karuizawa. Ichika sees them from a distance and follows them. Kanna had to leave Kaito when she finds out Remon has been filming their “date.” It so happened that Ichika crosses paths with Kaito. Nervous of the prospect that she wants to talk to him, he runs away from her, and a chase ensues. It was all about a misunderstanding—that Kaito wants to know Ichika’s secret, while Ichika wants to know who dumped Kaito. When Kaito took some footage of Ichika, it turned out into some sort of an informal confession. Shocked, Kaito stops filming her.

“Together with Senpai…” “Senpai to Issho…” (先輩といっしょ…)

In this episode Ichika is revealed to be an alien journeying to look for a certain scenery that she has been seeing in her imagination. She crash lands on Earth when her spacecraft hits space debris. Meanwhile, Nanami awakens, saying she has had a dream about Kaito being hugged by a naked girl in a ball of light. Nanami gets to know Ichika, and out of nervousness the latter almost reveals that she is an alien, but manages to convince them that she is a foreign student. Listening to her story, Nanami lets her move in with them, since she will be away for quite some time, and she was looking for someone to take care of Kaito. Kanna was surprised to hear it, even thinking it to be some sort of a wedding arrangement in exasperation. After seeing Nanami off the next day, and right after shopping for clothes for Ichika, Kaito finds Remon, Tetsurō, Mio and Kanna inside the house—to talk about the movie project. After Remon served them some sort of spiked alcoholic drink, which had “bad” effects on Kanna, Kaito again fainted due to the same illness, but Ichika kissed it away.

“I Can’t, Senpai” “Komarimasu, Senpai.” (困ります、先輩。)

While testing his high-speed film video camera, first year high school student Kaito Kirishima sees a bright blue light, then an impact has blown him off of his footing and beyond the railings. He sees a hand grabbing his as he fell, bloodied, only to wake up in his futon the next day. At his school, a transfer student named Ichika Takatsuki comes to a third year class. Somehow the both of them has a familiarity with each other when his classmate Tetsurō approaches her and her classmate Remon Yamano, proposing that she joins a movie project he and Kaito are planning. She accepts it without hesitation, and Remon volunteers to write the script. Kaito’s classmates Kanna Tanigawa and Mio Kitahara volunteered later. When Kaito goes to test his camera after class, he finds Ichika fishing in the river. He finds out that she has nowhere to go, so he unwittingly offered her to stay at his house, given that his sister will be away for three months. Back home, as Ichika takes a bath, Kaito felt pain in his neck, then sees a flashback of what happened the evening before. Ichika finds him unconscious, with a sign of increased metabolism on the area where that insect bite was. Ichika then calls for her assistant Rinon to stop it, as she kissed him. Exactly as Kanna and Kaito’s sister Nanami arrive.

Kozue runs away in shock at the sight of the twins making love, while Nao calmly left the scene, but Sora wouldn’t even care. Haruka thinks of ditching school, but she tells him to think little of it. Kozue tells him the next day that she’ll never talk to him again, while Nao effectively ends her relationship with him after his apology. That night Haruka fights with Sora when he tells her that they stop doing it, even inadvertently hitting her. Things get complicated when they find out that their parents left no money for the two, and in order to survive they have to be taken under custody of their relatives, but this means them living apart. That afternoon Haruka awakens to find Sora missing and her room in a mess. He goes looking for her after receiving a text from Sora which sounds like a suicide note. Nao even helps him in looking for her everywhere, mentioning to him about her confrontation with Sora, saying she has seen the two making love that summer day, and that “now they are even.” Haruka then remembered the lake Akira mentioned the other day. Haruka finds Sora, and his attempt to stop her from going deeper in to the lake nearly ends in them drowning. Days later the two leave the place to live together overseas in the city where an artisan who had connection with their parents lived, hoping to find happiness elsewhere. Though Kozue disagrees, Nao believes they will do just fine.

Haruka takes Nao on a date again, but he cannot shake the sight of Sora masturbating that night off from his mind. Eventually Haruka hits his limit and tries to get rid of those thoughts by taking Nao to a hotel, but she rejects his act and asks if he really loves her. Haruka is unable to answer and returns home. Soon after, Sora gets a fever and Haruka stays home to take care of her. That evening, Sora, with her fever subsided, confesses her feelings to Haruka and the two make love, beginning a relationship. This did not go unnoticed, as everyone, especially Kozue and Nao, begins to see the twins spend more and more time with each other. One afternoon, when Kozue and Nao decide to visit the Kasugano residence, they catch the twins in the middle of making love.

This episode replays to the event where Haruka is trying to talk to Sora about his relationship with Nao, but this time Sora is always at the back of his mind, since, lately, she seems not to accept Nao, and that she seems to be teasing him. Haruka suggests a date with Nao, but cannot get to tell Sora about it, even disguising it as if he will be spending time with Ryouhei. During the date, though, Nao notices that Sora is never far from Haruka’s mind, him buying things for his sister rather than for her, and eventually spoiling their date. They plan to make croquette curry upon arriving home, but is canceled when Haruka finds Sora not feeling well in her room after having a bad dream. The next day Nao notices that Haruka tries to hide his date with her from Sora, but she just went along. One night, Haruka catches Sora masturbating in her room while mentioning his name, much to his dismay—she is enamored with him ever since that one summer day in their childhood when Haruka kissed Sora while playing.

Sora decides to follow everyone at the beach, but at the moment she got off the bus, news that a young man was rescued from drowning unconscious. As Sora looks over, she finds out that the boy in question is Haruka. However, Nao acted quickly and performed mouth-to-mouth resuscitation. With that event, Sora becomes even more insecure, eventually telling Haruka not to leave home and tells all sorts of excuses just to make him stay. One day, Sora made Haruka choose between her and Nao, but he just shrugs it off and proceeds to school with Nao as if nothing is wrong. That afternoon Haruka finds Sora missing after receiving a text from her saying “Let’s leave here.” Akira, Kazuha, and Ryouhei joins Nao and Haruka in search of her, until, amidst the rain, Nao finds Sora at the bus stop. Refusing to go with Nao, Sora runs out of the bus stop, angrily telling her that she is the reason why Haruka has changed. Suddenly, a bolt of lightning strikes the bus stop and burst into flames. Sora then remembers she forgot her stuffed bunny inside. Nao rushes in to retrieve the only memento Sora has of her mother, causing her to be nearly trapped inside. After receiving the rescued item, Sora reveals to Nao her insecurities with her, that she is afraid Haruka would leave her alone. The next night, Sora joins everyone during the Summer Festival at the shrine. This time, Sora is more receptive of Nao.

By now Sora is showing her hatred of Nao in the open, even in front of Ryohei and Nao herself. One afternoon Sora, attracted by the smell of curry cooking in the kitchen, catches Haruka and Nao making love in the living room. Sora throws Nao out of the house, warning her not to see Haruka ever again, since it is the second time she catches the two doing the “dirty deed.” She then throws the curry they cooked down the drain, as she only wants Haruka’s cooking. Nao is desolate after that, and though she wants to see Haruka, she has to hide because Sora is always nearby. However, Haruka is always optimistic Sora will forgive and accept them both, as he, after knowing from Ryouhei that she changed, wants Nao to return to being a cheerful, caring, and lighthearted person. Sora lightens up a bit to the sight of Haruka and Nao being together, but still has some resistance, and prefers to distance herself from the two. It is for this reason that she never joined Haruka and Nao along with Ryouhei, Kazuha, Akira, and Motoka for the annual summer trip to the beach.

This episode replays the event where Sora asks Haru to take her measurements so she can have a uniform made. The next day Nao comes over to bring Haruka some mosquito repellent, since Sora is scared of mosquitoes, and then leaves almost immediately. The next day Ryouhei invites Haruka to the school rooftop to take a peek at the girls cleaning the pool. Haruka warns Ryouhei, though, not to peek at Nao, and leaves. Much later Ryouhei tells Nao that Haruka, “the prince she has been waiting for,” has a crush on her; but she thinks he does not like her. The truth is that something happened between the two many summers ago: Nao, trying to escape the noise of her arguing parents, ran to Haruka’s house. At that time Haruka was sleeping at their veranda, and was surprised to see Nao on top of him with her clothes undone. Until now Nao feels guilty for what she did. However, Ryouhei, even Akira and Kazuha, is into the act of bringing Haruka and Nao together. They did so by making the two meet at school pool on a Sunday. When they were changing after the swimming lesson, Haruka rushes into the girls’ locker room when Nao was scared by a black cat inside a box. The school supervisor hears their chatter, but the two were able to hide inside a box before he catches them. Thinking it was just the cat, he leaves. There, Nao gets to know that Haruka does not hate her, only that he was just surprised at the events of that summer day, dispelling her assumptions. Meanwhile, Sora shows her hatred of Nao, whom she thinks is the reason why Haruka has been preoccupied the past couple of days, at home on her laptop.

Haruka enters Akira’s room and stops her from burning something, which is her mother’s missing journal, where it is written that Kazuha and Akira has a chance of mistaken identity. With the journal, he suggests to Yahiro and Kazuha a DNA test to prove things once and for all. Yahiro refuses, but, despite disapproval from her mother, Kazuha agrees. Haruka informs Akira at the shrine the next day that the DNA results will be out in five days, but Akira disappears on the fifth day. Haruka finds her at the train station, where they talk until the evening. When the DNA results arrive that night, Kazuha and Sora delivers it to Akira, who is still at the station, but she buckled, too scared to read it. It is then that Kazuha’s mother appears, and tells everything at their home, where Akira is shown the lost pendant, returned to her by someone who found it at the mountains, basing on the name engraved on its back. She reveals that she and Akira’s mother had shared the same hospital room, and, one day Akira pulled the pendant off of her neck as Mrs. Migiwa held her in her arms. After hearing that Akira’s mother had died, she gave the pendant to her to make her feel, at least, the presence of a mother. Akira then reads the DNA results, and it read negative, which means Akira is born of a different mother. There, Kazuha’s mother let her keep the pendant, and apologizes to Akira. She later confesses her love for Haruka and vice-versa.

The Introduction to this episode replays the event where Haruka was standing near the girls locker room, overhearing Akira’s and Kazuha’s conversation, but this time, instead of walking away mislead, Akira comes out and takes the phone from Haruka. This allows for the story to have an alternative ending. Haruka notices that Akira has been acting strange lately, and decides to talk to her alone at school the next morning. He sees the sad look on Akira’s face and becomes worried, and wants to help Akira find her mother’s pendant (after remembering her losing it as a child). They go in search for the pendant by a tree they would play by as kids, only to Haruka’s horror that the tree had been removed by a landslide. He attempts at digging around for it, but without any luck. The two go to Akira’s residence to take a bath, and have a romantic moment together. From there, Haruka goes to the festival, and, after seeing Akira cry while dancing the sacred dance, rushes off to see what had happened.