MediBang - Suddenly transformed into a girl - Adult Sex Game

The main character Kazuo Kamiya has a headache from studying too hard.
As he does not know what to do, he goes to the health room to get headache medicine from his phys-ed teacher's father.

Kamiya who had taken headache medicine was lying down on a futon in the health room.
However, when he woke up, somehow he had transformed into a girl!

Following this, his friend Hayashi came to the health room and saw his female body.
He wants her body, but….

Following this, our main character felt a sense of crisis at being the only girl in an all-***s school.
Just as he was about to take his bag and leave the classroom.
A group of three ruffians interested in the female body approach
Takeda, the boss of the ruffians, falls in love
and aims for his chastity.