Never

"In the end, he is all he is."

-

His hands burn, itching from the heat of his flames, as he ends the war with the Milliefiore with a single, final move.

And with it, is a life lost and gone forever. Byakuran is defeated, while Tsuna is left to realise what it means to have sinned, and what it means to be a killer.

Tsuna moves on, but he doesn't let go.