 If you liked
Katekyou Hitman Reborn!
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 ...then you might like
Futagami☆Double
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If you enjoyed KHR's dying will concept then Futagami Double is worth a read as it shares a similar type of powering up. The protagonist in FD is a meek schoolboy who transforms into a stronger state to fulfil a will of theirs, very much like Tsuna.
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Recommended by badgerkins