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A story about a boy named Yuyu who doesn't fit in the real world and travels to the Demonic Realm. He encounters demons more powerful than himself and meets a Demon Spirit named Gallet. Gallet and Yuyu seemed like an unbeatable team, then appeared Pluler. Join Yuyu, a half demon, Altair, few living member of an alien race known as a Staranian, Ann and Shu as they fight in tournaments, learn new abilities and take on other demons, aliens and humans to finally stop Pluler's schemes.