Himouto! Umaru-chan: The Secret Umaru-chan

本片是一部日本动画片，上映于2017-04-19，由太田雅彦导演，由田中爱美/野岛健儿/影山灯主演。

剧情简介：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.

外文名：干物妹！うまるちゃん 秘密のうまるちゃん

类型：动画 / 喜剧

地区：日本

导演：太田雅彦

演员：田中爱美 / 野岛健儿 / 影山灯 / 白石晴香 / 古川由利奈 / 前田弘喜