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When high school student Renji Takeshi accidentally activates the Book of Gates, he becomes the target of warring secret factions seeking its power. Thrust into a hidden war of summoners, assassins, and monsters. Renji must train under the fierce Akane Hoshino to master combat and summoning magic. With his mischievous summon, Shiro, by his side, he balances school life with deadly battles. But as darker forces awaken within the book, Renji must uncover its true purpose before it consumes him.

This series is rated Young Adult. Please review the Content Ratings page for more information.