I'll Bite You To Death IBYTD

Hibari is an ordinary guy who has an intimidating appearance that makes people walk away from him out of fear.

One day while sleeping on the roof of his school, Hibari is killed by a plane that crashed at his school.

Hibari didn't even notice that he died.

When he woke up the next day, he was now Hibari Kyoya from the anime Katekyou Hitman Reborn.

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Katekyo Hitman Reborn fanfic, with Hibari Kyoya as protagonist.