The White Devil of Leviathan

Namikaze Haruto used to be a normal, healthy highschool boy. His life was good. He was smart, strong, and very popular with the ladies. He knew his live were supposed to be simple. he was supposed to live normal lives, get normal education, perhaps someday give up the foolish notions of building his own harem and settled down with nice girl. It would have been nice... It could have gone on forever. Then some S&M-wearing Fallen Angel shit came and messed everything up.