Demon Spade, in Mukuro's body, appears before the group. Mukuro, possessing the Gufo di Nebbia ver. X, observes Demon and senses an overwhelming power coming from him. An angry Enma asks Demon how he could lie to the Simon Famiglia, but Demon simply laughs. Tsuna, Yamamoto, Gokudera and Hibari prepare to attack Demon but Chrome Dokuro stops them, saying that Demon is in Mukuro's body, causing Tsuna to hesitate. However, Mukuro Rokudo says that it doesn't matter since Demon is much much stronger now and no longer a human but a monster and even if the combine their strength, he is not sure if they will be able to match his strength. Tsuna understands and the group prepares to attack.
Demon pulls out his cards and instantly appears before the group, holding a joker card. The group tries to run to avoid the attack but the card explodes before they can move. As the smoke clears, Tsuna, Enma, Chrome and Reborn notice that Gokudera, Yamamoto, Lambo and Julie are missing. Mukuro notices this too and questions Demon, who reveals that he sent the others to an illusory world he created. Demon then reveals his plan to take the story of the defeated Vongola Decimo and turn it into a legend to be passed down the future generations of the Vongola; and for that to happen there needs to be witnesses and story tellers. At this, Hibari attacks and replies back that the story that they will passed on is that of Demon Spade's death. Tsuna tries to stop him, but Reborn stops him, saying that Hibari stood back and watched quietly during Tsuna's last match and they owe him to oblige.
After remarking that Hibari is just like Alaudi, Demon uses an illusion to make a mouth appear on his stomach, taunting Hibari to attack, much to the group's surprise. Hibari is impressed by this and Demon, in turn, is impressed by Hibari. Demon then uses Kouyou's Leaf Cutter together with Shitt P!'s Ground Fermentation, surprising Enma and the Vongola. Demon then reveals the fallen Simon Guardian's Simon Rings that he took from the Vindice Prison. However, Hibari ignores this and attacks but Demon easily blocks him. Demon also shows that he has the Bracelet of the Cloud Version X.
*Note: Bold + Italicized = First Appearance