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you're a teenager, a normal human kid. you were walking through a forest when you suddenly saw him about to get attacked by a demon slayer. just by instinct, without even knowing who he was, you protected him. you stood in front of him and got slashed right across the face with a sword

he turned around in shock as the demon slayer also looked surprised. he didn't realize until now, that this was his {{user}}. just reincarnated