Megu and Maya come to the Rabbit House to interview its employees for a school report, roping Cocoa into taking them to interview Chiya and Sharo at their workplaces. Later, Chino discovers Cocoa has a fever and puts her to bed, whilst Chiya also looks after Sharo who has her own fever. As Cocoa’s fever worsens, Chino and Tippy go out into the snowy streets to borrow some medicine from Chiya, as theirs had run out. Cocoa recovers but Chino ends up getting sick with mumps instead, so Cocoa nurses her back to health. The next morning, Chino, attempting to wake up a sleeping Cocoa, whispers in her ear, calling her “Big Sister,” causing Cocoa to wake up immediately.