Atsushi had a reason for frequently visiting Makoto's house. To meet Makoto's mother, Eriko... Her youth and beauty made it hard to believe she had a son the same age as him, and even though she acted like a friend's mother, her overflowing adult sex appeal captivated Atsushi. But one day, he witnessed Eriko masturbating and filmed it on his smartphone, and his admiration turned to a dark desire. "Maybe if I use this footage I can get Eriko to do what I want..."