Masahiko Ohta

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.

Short OVA bundled with the volumes 1 to 6 of the Blu-ray releases of Sabagebu!

어느날 텐치의 앞에 자칭 텐치의 딸이라는 16세의 여자아이 마유카가 나타난다. 하지만 와슈의 실험 결과 마유카의 주장은 사실인 것으로 판명되고, 믿을 수 없는 이 사건에 대해 텐치 일행은 놀라움을 금치 못한다. 결국 마유카가 미래에서 온 텐치의 딸이라는데 동의를 한 일행은 곧 마유카의 엄마가 누군지에 관심을 쏟는다. 하지만 마유카는 아빠에 대한 기억 밖에 없다고 말하는데...