When Riko heard that her mother-in-law had collapsed, she went to her husband's parents' house where her mother-in-law and brother-in-law lived. Her brother-in-law was crying beside her sickbed, and it seemed that her condition was not good. However, that night, Riko witnessed her brother-in-law assaulting her mother-in-law. Her brother-in-law was a mother-complex boy, and his love for her had been distorted by the fact that his mother-in-law was bedridden. Then, enraged by the interruption of their act, he violently assaulted Riko...