In a twist of fate, a guy finds himself reincarnated as Shade, a four-eared monkey. With memories from both his past life and some of Shade's own, which he must unlock, he soon realizes he's been reborn into the very book he was reading— as one of the side villains. Determined to change his fate, Shade decides to help the heroes seal away the Seven Demon Lords and stay close to them. However, there's a significant problem: his childhood best friend, Law, the protagonist of the book, is destined to kill him in the first volume.

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