Dragon girl comes down from the heavens and accidentally forges with some popular kid and steals his body in order to find a related dragon god that escaped from heaven.
Girl gets tied up in a human's life, and the guy fights her for control of his body. Focus around that relationship and SHOUNENZ commence soon after.
Includes a lolicatgod, hot class president/childhood friend of main guy, an extremely manly gym teacher, and an aversion to avacados.
It would make millions