Hibari emerges victorious in his battle against Adelheid, causing Tsuna to reflect on what he couldn't give up. Meanwhile, the Vindice arrive to retrieve Adelheid as well as to present the fourth "key". Revealing that during the war between the Vongola and a rival Family, the Simon Famiglia was stranded and surrounded by enemy forces. Hearing this, Giotto decided to aid Simon Cozzato in their fight, but was halted by Demon Spade, who claimed it would lower the morale in their troops should their leader leave, and promised to save Cozzato's Famiglia himself. Thus concluding the contents of the fourth "key".
Hibari then notices Julie Kato and Chrome Dokuro hiding nearby. Drawing them out, Adelheid proceeds to ask Julie if he would take care of Enma, prompting Julie to reveal his true identity as Demon Spade. While Tsuna and the others refuse to believe Demon would exist in their time period, Demon remarks that he will continue to exist as long as some men like Tsuna is born, revealing that all he has done in the past and present was all for the sake of the Vongola, which he claimed needed a leader to surpass Giotto.
Demon then says he believes greed and power eventually lead to absolute justice, and with Giotto's personality it would've been impossible, forcing him to take matters into his own hands. Tsuna then accuses Demon for setting the Simon Famiglia up, to which he responds that Cozzato's Famiglia was becoming powerful and were inspiring ideas and feelings of weakness inside the Primo, hence their "glorious" fate. He then turns to Adelheid, saying she has done well. Adelheid is reminded of her past and relationship with the real Julie Kato and demands to know where Julie is, as she blames herself for everything that has happened. Demon simply brushes her reaction off, saying they are children after all. At this moment, Kaoru Mizuno bursts into the battlefield and impales Demon with his arm blade, claiming that he would never forgive Demon for what he has done.
*Note: Bold + Italicized = First Appearance