Umaru Doma seems like the perfect high school student, but her true colors emerge at home when she transforms into a lazy, junk food-loving otaku in her hamster hoodie. Her older brother Taihei ends up handling all the chores. Alongside her friends Nana Ebina and Kirie Motoba, and her self-proclaimed rival Sylphinford Tachibana, Umaru enjoys her carefree moments. 'Himouto! Umaru-chan' portrays the everyday escapades of Umaru and Taihei, navigating their sibling dynamics and friendships with humor and warmth.