The mc (guy) has a guys upper body but a girls lower body and has to chose to be girl or guy. There is a hospital type place in his school and he meets a girl there, they like each other but a guy like him.[spoiler] He ends up with the guy

Houkago Hokenshitsu

"The world is a dangerous place to live, not because of the people who are evil, but because of the people who don't do anything about it." - Albert Einstein

Thank you