通り雨にて 或いは、少女はいかにしてその心情に至ったか?
Tōriame ni te arui wa, shōjo wa ikani shi te sono shinjō ni itatta ka?
In the Passing Rain, Or, How Can a Girl Have Reached Such Feelings? ~ Regenschauer (lit. Heavy Rain)

Nana is still settling in at Kohta’s home. After nearly killing Mayu when her arm flies off while trying to chop lettuce, Nana is given the task of helping Nyū clean the house. However, Nana treats it as a competition between her and Nyū, and repeatedly hurts herself and damages the building as a result. After getting in an argument with Kohta about her role in the house, she runs away and ends up at the beach, where she meets Bando again. He figures out that Nana knows where Lucy is and coerces her into agreeing to bring Lucy back to the beach that night. Later, Nana manages to get Nyū out of the house by saying she wants them to take a walk together to apologize for her earlier behavior, and she gets back to the beach where she starts having second thoughts. It starts raining, and Nyū slips in a puddle of water and hits her head, knocking her out. While Nana gets Nyū sheltered from the rain and tries to reawaken her, Nyū, now Lucy again, has a flashback of a time five years after her first encounter with Kohta (three years before the present day).
During the flashback, Lucy is shown to be hiding with Aiko Takada, who shares a similar interest in her as Kohta does. Lucy has been living day-to-day as a runaway for the past 5 years. However, when Kurama appears with some soldiers to try and capture Lucy, Aiko pushes her out of the way and takes a bullet to the chest that was meant for Lucy’s head. In order to save her friend’s life, Lucy agrees to sacrifice her freedom, and surrenders to Kurama without a struggle. Kurama promises Lucy that he will do everything he can to save Aiko, but she still ends up dying. When Kurama tells Lucy this, she tells him that she will not kill him, but instead take away everything he has ever loved, like he did to her, and she is shown crying through the mask on her face. Back at the beach, Nana is worried about Nyū because she won’t wake up, and Nana can feel Lucy’s life slipping away. Nyū then wakes up and, after Nana apologizes, Kohta, Yuka, and Mayu find them and they all walk home together.