Six months after the marriage... the sudden death of her father-in-law. To take care of her mother-in-law, Chisato, who had lost her husband, Yuna ended up living with the Shoda family. The bizarre behavior of Chisato, who had lost her mind, exceeded Yuna's imagination, with incontinence, wandering, and lying escalating day by day. One day, unable to bear seeing Chisato masturbating alone, Yuna tried to stop her but was mistaken for her deceased husband and raped. The lesbian training that began from that day... However, Yuna had no way of knowing that this was the obscene desire hidden deep within Chisato's forgotten past.
