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Injured Friends(傷つく友たち ) is the 21st episode of the anime series Katekyō Hitman Reborn!.
Synopsis
Gokudera defeats Chikusa but then Tsuna arrives and Chikusa learns that Tsuna is the Vongola Tenth. Later, Yamamoto runs into and defeats one of the other Kokuyo Junior High Gang members, Ken Joshima.