Struggling with the heartbreak of his wife Akane's sudden departure, Akihiko finds solace in a taboo relationship with his aunt, Fujino. When Akane's mother, Sayuri, arrives to deliver divorce papers and learns of her daughter's infidelity, she decides to take responsibility for Akane's betrayal by offering Akihiko her own body as compensation.
Akihiko takes in Shizue, a broken woman who attempted suicide after being abandoned by her husband for Akane. As Shizue finds shelter and comfort, she is welcomed into a passionate, shared relationship with Akihiko alongside Sayuri and the other women in the house. Despite their internal jealousies, the group decides to live together in harmony, collectively rejecting Akane when she returns to reclaim Akihiko.