Reborn! –Episode 31 "Welcoming at Mafia Island"

When Tsuan and his friends arrived at Mafia Island, Tsuna was failed to prove his identity as the Vongola Family's 10th boss.

Due to the matter, Tsuna has been transported to the back of the island where he is given a new chance to prove himself.

In there, he meets another Arcobaleno, Colonello. Both Colonello and Reborn put Tsuna through tough training.

Meanwhile, another Arcobaleno, Viper was trying to invade the island with an army.