ちぃ おつかい
Chii Otsukai
Chi Goes on Errands

Hideki comes to realizes that Chi doesn’t have “pantsu” (“Underpants” in the dub). Since he’s too embarrassed to get them himself, he lets Chi go to a lingerie store to buy them with the help of Sumomo’s navigation system. After several mishaps and mistakes, Hideki finally plucks up the courage to run into the store and buy them himself and run back out.