Tooru, a 16-year-old girl who lost her mother in an accident, moves in with her grandfather. However, since his home is under renovation, she cannot stay with him. Reluctant to burden her friends or face her family's criticism, Tooru opts for living alone in a tent in the woods. One night after returning from work, she finds her shelter buried by a landslide. Luckily, Yuki Souma, the "prince" at her school, and his cousin Shigure, a famous writer, come to her rescue and offer her a place to stay until her grandfather's house is ready. Tooru soon discovers a secret about her new hosts: the Souma family members transform into animals of the zodiac when hugged by someone of the opposite gender! However, this is not a harmless quirk but a curse with a dark past. As Tooru meets more zodiac members and learns about their struggles, she wonders if her kindhearted yet steely nature will be enough to face the challenges lurking in the Souma household.