Josou de Haramasete by Momoiro Gekijou - Adult Sex Game

Yuu lives with his mother. He looks delicate, but he practices martial arts hard every day to be a martial art fighter like his father.

One day, his mother suddenly says to him,
"I'm actually your father..."

According to him, he will become a woman if he does not make a human in female costume by a certain age.

Therefore, he joins a girls' school in female school uniform to find his fiancee...