To the rest of the world, Umaru is kind, smart, and the perfect high school student. But her brother, Taihei, knows the truth: at home, she's a bratty, slovenly, lazy girl who eats junk food, plays video games, and throws tantrums when Taihei won’t buy her manga or do what she wants! Now, in addition to working full time to support their household, Taihei must do all of the cooking, cleaning and shopping while Umaru enjoys her carefree days as an unabashed, yet secretive, otaku.