The Lewd Princess Great Adventure

Michio, an unsuccessful manga artist, begins drawing an erotic manga with a heroine, a demon girl (Rino), modeled after his girlfriend Suzuko (Azuki). However, after deciding on the character, he can't come up with a good idea and indulges in masturbation. The moment some of his semen falls into an ink bottle, the demon girl in the illustration starts talking to him. The demon girl then materializes a beautiful girl character named Michiko (Abeno Miku) for Michio and puts Michio's soul into it, but...