“후회하지 않기 위해, 다시 널 만나러 왔어” 산으로 둘러싸인 시골 마을, 그곳엔 꿈을 위해 쉼 없이 달려가는 자매 ‘아오이’, ‘아카네’ 그리고 ‘신노’가 있었다. ‘신노’는 함께 도쿄 상경을 약속했던 ‘아카네’를 찾아갔지만, ‘아카네’는 혼자 남을 동생 ‘아오이’로 인해 꿈을 접는다. 13년 후, 고등학생이 된 ‘아오이’는 언니에 대한 죄책감과 자신의 꿈 사이에서 방황하고 두 사람의 관계는 점점 멀어져 간다. 그러던 어느 날, 두 사람 앞에 다시는 만날 수 없을 것 같았던 ‘그’가 전혀 다른 모습의 두 사람이 되어 동시에 나타나게 되는데… “어째서 내게 다시 찾아온 거야?”
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.
