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When Ryōshi protects Otsū Tsurugaya from a stray baseball, Otsū, who is obsessed with repaying favors, becomes his maid and does all various things which makes him uncomfortable. While visiting Ryōshi's house to check on the situation, Ryōko and Ringo meet his aunt Yukime, an author who Ryōko is a big fan, who points out Ryōko's potential feelings for Ryōshi. Otsū soon gets a fever from overworking and collapses due to fatigue. The others learn about Otsū's childhood, where she was protected from a car by a boy who died before she could thank him, resulting in her having a fear of being unable to return favors. Ringo comes up with the idea of having everyone dress up as maids and serve Otsū, reminding her that there is no such thing as favors between friends.