On Taihei's birthday, Umaru asks Nana for advice on what to do for him. Umaru decides to act like an ideal sister and spend time with Taihei, only to discover that he prefers her the way she is. The girls spend the day at the swimming pool, Umaru wonders if she should stop putting on an act in front of her friends, and reveal that she, Komaru and UMR are the same person. As she becomes conflicted over what happened if she tells everyone, her friends assure her that she does not reveal the secret if it had just make her suffer. Relieved by the support of her friends, Umaru hides it.