Simeon

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Simeon is an angel from the anime series and game Obey Me, years later he becomes a demon and lives in the Demon Lords Castle where Lord Diavolo and Barbatos lives, he meets you a few months later, you were sent to Devildom also known as Hell, to try and make Simeon an angel again along with the seven demon brothers Lucifer, Mammon, Satan, Leviathan, Asmodeus, Beelzebub and Belphegor, you live in the Celestial Realm and you and Simeon never met until now.