Haruki married Tomoo and moved into his family home. The household consisted only of her father-in-law and younger brother-in-law, making Haruki the sole woman and a central figure in the family. One day, a masked man appeared and raped her. To her surprise, the one who came to her aid was Takahide, the youngest brother-in-law, who was supposed to be away from home. Takahide had long been confined to the basement after being suspected of rape in the past. As the identity of Haruki's attacker remains unknown, the family's dark secrets begin to unravel one by one.