The Last Dying Will Bullet is the 23rd episode of the Katekyo Hitman Reborn! anime.
With Tsuna running after Futa, the others are left to deal with the one claiming to be Mukuro himself. He proves to be too much for them in the state they are in, so all hope lies with Tsuna coming back in time. However, even if he does, there is only one Dying Will Bullet left.