Himouto! Umaru-chan #1

This debut volume of the slice-of-life manga series introduces Taihei Doma and his younger sister Umaru, who appears to be a model student in public but transforms into a lazy, gaming-obsessed otaku the moment she steps through their apartment door. Collecting the opening chapters of the original Japanese run, this edition sets up the comedic dynamic of a responsible older brother trying to manage his secretly slobbish sibling's antics.