There was a battle going between the villains and the heroes, until one of the villains had a particular quirk that can open up portals. Except it was an alternative universe with UA and the lives of others, the side affects that the portal will stay open until 4 weeks til closing.
The Pro heros protected this from the public and kept it well hidden to prevent the citizens from figuring out what was going on and jumping onto conclusions or even accuse of false hope on the Pro heros.
But it was into its own hands as the alternative versions of themselves with different similar appearances and lives to them, but at the same time it was chaotic and somehow the alternative universe was more mellowed out than there own.
Til Shota seen the alternate version of himself still had his left eye and leg, while he himself had a prosthetic leg, and an eye patch.