Mafia 30. Yakuza Clans war.

By the way, what is that manga about, "Knight-Vampire"?

It's a shoujo manga. It's about a girl who studies at a school with "normal" and "vampire" classes. Her parents were attacked by a vampire, but another one (the school director) found her and raised her. Well, I know the names of a couple of characters, and that's about it (because I don't usually read this kind of stuff).

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And I think Haven should be eliminated, he tried to start a nuclear war in the city, and he's not even trying to expose the Mafia.