Plot
Unaired special of Himouto Umaruchan included with the mangas tenth compiled volume Realizing it is Taiheis 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 Later as the girls begin their summer vacation by going to a 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 Umaru becomes conflicted over what will happen if she tells everyone her friends assure her that she doesnt need to reveal her secrets if itd just make her suffer Relieved by the support of her friends Umaru makes the decision to continue hiding her secret