"Mom, I'll be home at 7 pm after my part-time job..." she told her beloved son, until the date changed, when she became the neighbor's convenient mistress. (Mizuno Yuka ROE-265)

The father is single and lives alone, leaving his mother, Yuka, and son to live together. The son is introverted, always a source of worry for his mother. However, last month he became good friends with Yuta, a classmate who moved next door. They play together every day, and the son even confided in Yuta about his secret job, despite it being forbidden. However, Yuta prioritizes satisfying his teenage sexual desires for his beautiful mother over protecting this secret. When his mother tells him she'll be home from get off work at 7 pm but doesn't return, the son rushes out of the house worriedly, only to hear heavy breathing coming from Yuta's room…