What You Believe In is the 91st episode of the Katekyo Hitman Reborn! anime.
With no escape routes available, and Mukuro Rokudo being in a weakened state, Mukuro explains to Chrome Dokuro that it is up to her to win the fight. Drawing power from both her trust in Mukuro and the Vongola Ring, Chrome's illusions become far more effective, to where even Glo Xinia can't tell whether or not they are real. The fight soon concludes in a victory for Chrome, and the ten-years-later Ryohei Sasagawa is introduced at the very end of the episode.