Momoko married a man with a stepchild. - Although she wants to become friends with her son-in-law Yuta, he still keeps her distance. - However, when Yuta consults with Yuta, whose grades at school have been declining recently... - Apparently, he couldn't control his sexual desire and was obsessed with masturbating. - In response to this, Momoko, even though she is a mother-in-law, puts her body on the line to give sex education to her son. - Yuta ascends repeatedly through his stepmother's ejaculation management education. - Thanks to Momoko's efforts, the distance between the two gradually narrows...