Following the loss of her mother in an accident, sixteen-year-old Tooru resides with her grandfather until his house undergoes renovations, forcing her to leave. Afraid of imposing on friends or facing familial judgment, she chooses to live alone in a tent in the woods, claiming she will find housing. One evening, returning from work, she discovers her tent has been buried by a landslide. Yuki Souma, the school’s prince, and his cousin Shigure Souma, a renowned author, find her in this predicament and offer her a place to stay until the renovations finish.
At the Souma residence, Tooru uncovers a shocking secret: Souma family members who are embraced by the opposite sex temporarily transform into animals of the zodiac. This bizarre occurrence is not a joke but a heavy curse rooted in a dark past. As Tooru meets more members of the zodiac clan, she must determine if her kind and resilient spirit can help them overcome the burdens hidden within their home.