The Guardians get their Rings upgraded to the Vongola Gear, and the remaining Guardians head to the Simon Island to confront their attackers. Upon arriving, a battle with the Simon Famiglia against the Vongola Famiglia is announced, with the Vindice acting as judges. During each battle, the battling Guardians' pride would be at stake, with the loser being imprisoned in the Vindice Prison. Tsuna and his Guardians battle throughout the island, unlocking memories of the Vongola Primo, Giotto, and the First Simon boss, Simon Cozzato. With each battle they fight's memories, slowly begin to understand what really happened between these two people who were once considered to be as close as brothers.
In this volume, there's one exclusive panel that shows Koyo briefly reminisced his past during his fight Ryohei, that's not available in the Shonen Jump Magazine.