|Arc||Inheritance Ceremony Arc|
Yamamoto enters the battle after saving his friend, Kaoru Mizuno to fight against Daemon Spade. Kaoru cries still thinking he should not have been saved by Yamamoto because of how he injured him. Tsuna and Daemon wonder how Yamamoto had healed from his wounds. Daemon says that he should've been in 'critical condition' and could not have healed this quickly to which Yamamoto replies saying that Daemon should have died long ago. Daemon still wonders how Yamamoto was saved and he says that he was saved by an old acquaintance of his, Tsuna and Gokudera stare in surprise to the old acquaintance part. Daemon becomes enraged saying that his plan has gone for the worst and wants to finish it by his own hand like he did before.
Yamamoto becomes excited because he hasn't been in a fight for a while and Hibari gets mad because Daemon is his prey. Gokudera and Tsuna become worried because Yamamoto does not have his Vongola Gear to fight against Daemon Spade, but Yamamoto tells his friends that he brought it with him and reveals his Vongola Gear, the Necklace of the Rain Version X. Tsuna and Gokudera are surprised, saying that it got an upgrade. Yamamoto calls out his two pets Jirou and Kojirou and turns them into Cambio Form, turning his outfit turns into the one that Asari Ugetsu wore (excluding the hat), holding two swords. Tsuna calls it the 'Two Sword Style Vongola Gear'. Daemon stares in amusement at him, then attacks Yamamoto. Yamamoto blocks with great speed with both arms protecting himself from Daemon's scythe. Daemon forewarned Yamamoto to not just watch his front as another weapon comes from the ground about to stab Yamamoto. Gokudera screams for him to look behind him when Kaoru blocks the attack with his own body. Kaoru says that Yamamoto could have blocked that attack but tells him that he must repay his debt to Yamamoto. The Vindice come in saying the loser was Kaoru Mizuno. Adelheid tries to defend Kaoru, saying that he had not figured out his pride yet but the Vindice say that his pride has already been broken. Kaoru says that his pride was in the Simon but he felt like he was betraying all his friend that were kind to him and that he wanted atone for his crimes, losing his capability to fight the Vongola. Daemon then interjects saying that Kaoru was a piece of junk and says that they can now watch an interesting show. The Vindice then reveal the fifth 'key' that was a torn paper with a Dying Will Flame. Daemon says that the next memory is of when Cozarto Simon was killed.
In the memory, Daemon was talking to hooded figures who said they had found Cozarto and that he was holding his own against the enemies. Daemon says that he will come to Cozarto's rescue bearing the document of Primo's sign of approval letting down Cozarto's guard. He then goes to Primo who was waiting for news of Cozarto and Daemon, who is wounded very badly, says that it’s to late for Primo to save Cozarto. Primo looks down in shame, saying to Daemon that he was indebted to him, Daemon smiling in victory. Then the hooded figures that Daemon was taking to earlier come into the battle saying they are reinforcements for Cozarto and he replies saying that they are lying about wanting to help him but to kill him under Daemon Spade's orders. Cozarto tells them that he knew that there was a traitor among the Vongola because the third letter he got from Primo was a fake; he knew because Giotto signed his letters with "Giotto", not "Primo". Cozarto tried to act fast but noted that Daemon was already one step ahead of him but says that he would fight to the end for his Famiglia. The hooded men tear the paper in two saying that their boss was one step ahead of Daemon Spade and take off their hoods to reveal the Vongola Guardians. They then say that they would defend Primo's and Cozarto's friendship to the end.