The last thing anyone expected was for the older twin to manifest Cloud Flames. (Or the one in which Tsuna is Xanxus' Cloud Guardian, flat-out terrifies anyone who's heard about him, has a younger brother who loves him, is possibly in a queerplatonic long-distance relationship with Hibari but will never admit it, and is the big brother you never knew you wanted in your life.)

In which there are vampires and hunters and watchers and humans, Yamamoto Takeshi is more than a little bit crazy, and Gokudera Hayato is caught in between a whole bunch of loyalties and duties.

This is a dark Alternate History arc that follows what might happen if Mukuro had decided to make Xanxus his tool of conquest instead of Tsuna.

Omegas are inviting. Warm. The heart of pack life. Tsuna never believed he'd be any of those things. (Omega Tsuna, warm and wonderful but entirely unaware of it, unwittingly draws others to him and inspires unwavering loyalty.) No Mafia. Tsuna's "Family" is just his patchwork pack of similarly damaged children. Lots of platonic pack feels and bonding. Endgame Tsuna/Hibari.