Fusion Blade Academy (Male Reader x Harem)

After Gods of Fusion appeared on Earth, children began to develop special abilities based on their gender: If one is a boy, they are able to fuse with a partner of the opposite sex, growing immensely stronger in the process and even farther based on how close they are. If one is a girl, they are able to become that boy's weapon in combat, change their appearance, and communicate with them internally, providing them with immense strength.
The world's most famous Fusion Academy, Kashiwazaki Academy, is just starting a new year... and (Y/n) (L/n) is one of the recruits!