Following an accident that claimed her mother's life, 16-year-old Tooru moves in with her grandfather. However, because his home is undergoing renovations, she cannot continue living there. Although she claims she will find someone to stay with, she fears her family's criticism and does not want to burden her friends, so Tooru resorts to secretly living on her own in a tent in the woods. One night, on her way back from work, she discovers her tent buried under a landslide. Yuki Souma, the "prince" of her school, and his cousin Shigure Souma, a famous author, stumble upon Tooru's predicament and invite her to stay with them until the renovations at her grandfather's home are complete. Upon arriving at the Souma residence, Tooru uncovers their secret: if a Souma is hugged by someone of the opposite gender, they temporarily transform into one of the animals of the zodiac! However, this strange phenomenon is no laughing matter; rather, it is a terrible curse with a dark history. As she continues her journey and meets more members of the zodiac family, will Tooru's kindhearted yet resilient nature be enough to prepare her for what lies behind the Souma household's doors?