Clique culture has exploded at UA, and everyone is splintering off into new groups.

One by one, hero students keep venturing into these tight-knit groups, leaving just Izuku and Katsuki in the dorms most of the time.

The first to start showing up less was Tokoyami, now a member of The Woodlanders, a group of woodland animal quirked general studies students who hang out in the woods behind UA.

Mina joined a bunch of dancers who had taken over a support workshop, turning it into a studio.

Ochaco got dragged into a group of girls called the bubblegum pop collective, she got swept up in the energy.

Shoto's new friends, everyone calls the burnout brigade. They sit around drinking coffee and complaining about their families.

Kirishima is a gym rat, hanging out with a bunch of students who train like bodybuilders.

Momo joins a group from business studies called the brain trust, Iida gets involved with a group obssessed with racing, Sero ends up with a bunch of amateur filmmakers who make prank videos, Sato joins the gourmet society, Jiro is in the paranormal club, etc etc.

With everyone scattered across UA, their teamwork in training sucks now. Nobody's in sync, and if it continues, they won't function as a class at all. Katsuki is pissed at the entire thing, refuses to join any cliques but also refuses to help fix things, he just yells at people for ditching training.

So it's all on Izuku. If he can't pull the class back together, they might never recover as a unit.