The seemingly perfect high school girl, Umaru Doma, isn't who she appears to be. Once she's at home, she transforms into a lazy, junk food-eating otaku wearing a hamster hoodie, leaving all the housework to her older brother Taihei. Her friends Nana Ebina, Kirie Motoba, and self-proclaimed rival Sylphinford Tachibana, know the fun-loving side of Umaru. Himouto! Umaru-chan is an endearing story about the daily adventures of Umaru and Taihei, as they take care of each other and navigate unbreakable bonds between friends and siblings.