After 5 years, prior to the main storyline of Katekyo Hitman Reborn, the Sky Flames of the Arcobaleno Pacifier broke out from its container.
Bermuda, the leader of the Vindice, still held the remaining six flames.
On the other hand, the missing sky appeared before Kawahira/Checkerface. His only choice is to resort to his old way. Deceive people into protecting the pacifier.
But Tsuna took responsibility of everything. And now, he is the Sky of two: Vongola & Arcobaleno
How would he carry the burden of being a Sky of the Arcobalenos, when he is the only one cursed? Well, not that there are anymore Arcobalenos aside from him.
Two Sky responsibilities in one is the hardest quest he ever had in his life. How would he manage?