The sibling gag comedy manga centers around Umaru, Taihei's little sister who boasts beautiful looks as well as prowess in both school and sports. However, "Himouto" (beautiful little sister) has a certain secret. (Source: Anime News Network)The sibling gag comedy manga centers around Umaru, Taihei's little sister who boasts beautiful looks as well as prowess in both school and sports. However, "Himouto" (beautiful little sister) has a certain secret. (Source: Anime News Network)