Regret (後悔) is the 105th episode of the Katekyō Hitman Reborn! anime series.
Ginger Bread reveals that Colonnello died by saving Viper. He says that Viper then killed themself out of hopelessness. Lal Mirch remembers the time that she became an incomplete Arcobaleno because Colonnello took her place. She had a blue incomplete pacifier which she promised not to use so she would become human again. In the present time, Lal Mirch uses her pacifier and defeats Ginger Bread. It is revealed Ginger Bread was a doll and explodes, injuring Lal Mirch. Just then, the alarm goes off, informing the Millefiore of their presence.