Urotsukidōji

The game is based on the famous adult manga/anime series with the same name. It generally follows the main plot: the demon Amano Jaaku is banished from Makai (the demon world) to the Earth by the Elder, doomed to be trapped in a human body; he is given the mission of finding Choujin, the most powerful god, who is hiding in the body of a high-school student.