My friend's mother

One day, Souta, who had secretly fallen in love with the young and beautiful stepmother, Saki, of the young and beautiful stepmother, goes to Yosuke's house to visit, realizes that he had forgotten his smartphone and returns to Tori. The lock was open so when he headed to Yosuke's room he saw a scene where he couldn't believe his eyes, and it turns out that Saki and Yosuke were having sex. I can't believe that Saki, whom Yori had admired, has become a relationship between Yori, a man and a woman... Souta is angered at the mother and child who made her feel this way, and vows to take revenge...