After losing her husband, Eriko lived a lonely life. Her daughter and son-in-law returned home, bringing liveliness back to the household. Eriko felt joy as a parent in this bustling family atmosphere. Tatsuya, tense around his beautiful mother-in-law, woke up one night unable to sleep. Through a slightly open door, he caught a glimpse of Eriko's naked body, flushed from her bath. The next morning, the scene was seared into Tatsuya's mind and he couldn't shake it off. While Eriko was cleaning, he lunged at her… Their forbidden act brought them closer rapidly.
