Katekyo Hitman Reborn!

The Truth Behind the Mist (2x19)

:

The unexpected person, turned from Chrome, turns out to be Rokudo Mukuro. A series of chaotic illusions battle starts. During the fight, Tsuna experiences flashbacks of Mukuro on how he sacrificed himself for Ken and Chikusa to escape. Rokudo Mukuro ends up being the winner, almost killing Marmon, who escaped with his reserved power from the battle field. Rokudo Mukuro fainted after the battle, turning himself back to Chrome.