Tsuna gets taken off to Italy to get better acquainted with the Vongola. While he’s there, he has to come to some kind of terms with Xanxus. Kind of, sort of, mental Tsuna/Xanxus.
"I can’t believe you told Kaa-san this was overseas study," Tsuna grumbled as he was frog-marched to his doom.
Well, all right, not really frog-marched, his dad had his hands in his pockets and Reborn wasn’t tall enough, but the effect was the same.
"It is overseas," his dad said, cheerily. "And it’s definitely higher education."