My Girlfriend's Mom: The Day I Became My Girl

내 애인의 엄마: 내 여자가 되던 날

Also known as 我爱人的妈妈：成为我女人的那天, 2017-MF00409, 她是我的女人, 我爱人的母亲, My Fiance's Mom is My Girl

Koyuki, disliked by her young and beautiful stepmother, has a passionate love affair with her boyfriend Josuke at home. However, while Josuke is with Koyuki, he keeps thinking of her mother, who has a rich and mature taste. After that, Josuke, who was sentenced to break up with her Koyuki, unconsciously remembers her Misae and goes to find her.