Cuando murieron sus padres hace 13 años, Akane se quedó en su pueblo natal para cuidar de su hermana pequeña Aoi. Para aliviar la carga que supone para Akane cuidarla sola, Aoi quiere mudarse a Tokio tras graduarse e iniciar allí su carrera musical, inspirada por el antiguo novio de Akane, Shinnosuke "Shinno" Kanamuro. Shinno formaba parte de una banda hasta que se mudó a Tokyo siguiendo su sueño de convertirse en guitarrista profesional. Una tarde, mientras Aoi practica con su bajo en una antigua casa de huéspedes, se sorprende al encontrarse con el Shinno de hace 13 años, al mismo tiempo que su versión actual llega a la ciudad como miembro de la banda de un cantante de enka que ha sido invitado para actuar en un festival musical.
Unaired special of “Himouto! Umaru-chan” included with the manga’s tenth compiled volume. Realizing it is 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. 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 doesn't need to reveal her secrets if it'd just make her suffer. Relieved by the support of her friends, Umaru makes the decision to continue hiding her secret.
Unaired special of “Himouto! Umaru-chan” included with the manga’s seventh compiled volume. After being tempted by a pillow on the television shopping channel, Umaru has a dream reminding her to appreciate the pillow she has. The next day, Umaru goes with Sylphnford to the convenience store where she tries to win a lottery prize. Later, Umaru and Taihei go wild at a yakiniku restaurant, unaware that Nana is at the next table over. At the start of October, Umaru and Kirie get into the Halloween spirit early, dressing up in costume and trying various pumpkin-based snacks. Afterwards, Umaru decides to fake a fever in order to skip school, only to be overcome by guilt.
