Umaru Doma isn't a superhero, but she could be a super-villain if she wasn't so lazy, and addicted to snack foods, comics, and video games. At school, she still appears to be the fashionable "Miss Perfect" her fellow students believe she is, but when she gets home, the popular girl façade comes off! Then the hamster cloak goes on, and her ogre-like otaku side is unleashed! So far, the only one who knows the whole truth is her loyal servant... er, older brother, Taihei, but lately Umaru's been finding it harder to maintain the personalities that different people know her by, while her relationships with Nana, Kirie, and Sylphynford all seem to be getting closer. Is she getting... gasp! Nicer? Or is it all part of some diabolical plot in HIMOUTO! UMARU-CHAN R?