Tsuna and his friends are now in high school and it's time for their school trip. Tsuna was looking forward to it but all of his excitement vanished into thin air when Reborn ( in his adult form and disguised as the respectable Boreen-sensei ) showed up in his class to announced that Class 1-A will go to Italy for their school trip. And much to his horror, their trip was sponsored by Vongola and the date of the trip will fall on the same week of his and his guardians Inheritance Ceremony. While Gokudera and Yamamoto were excited, Tsuna was dreading the day and the inevitable that his classmates will found out the real him. That he's the boss of the most influential and powerful mafia famiglia in the world.