An ancient vow between the Chinese zodiac spirits and their god still governs the lives of the possessed Soumas, compelling them to return to one another. For those bound by it, that promise has become a curse that denies them freedom. Akito, the family head, insists on the unique connection he believes they share, while the others live apart and fear his punishment.
Having come to care deeply for the Soumas, Tooru Honda is determined to release them from the curse. Her relationships with the family and her friends give her strength to pursue that goal, but troubling revelations shake her resolve. With time running short and the future uncertain, she struggles to keep working toward a life free of the bonds that have constrained them.