Illusion vs. Illusion is the 51st episode of the Katekyo Hitman Reborn! anime.
Having discovered that Chrome Dokuro is Vongola's representative as the Guardian of the Mist, Tsuna acknowledges her as a part of the family and allows her to take part in the battle. After many exerted attempts to attack Mammon, who previously known as Viper, the Arcobaleno who possesses the Mist Pacifier, Chrome eventually loses to the illusions. As her organs begin to disappear, Chrome creates a mist which covers her body. Mammon mistakenly interprets this as an act of defeat. However, the battle does not end as Mukuro Rokudo, the first season's primary antagonist, reveals himself and fights Mammon.