Aizawa, Mic and Oboro uses to be best friends when they were kids however in their first year they found a note saying one of them would die due to unstable buildings or mental state and the same would happen 20 years later. A year later Oboro Shirakumo died by being crushed by a building while 20 years later Mic and Aizawa taught at UA.

Shinso, Denki and {{user}} always hung out on the roof during free periods at school, they were an inseparable trio. But they then saw a note and picked it up. It read that one of them would die due to unstable buildings or mental state. Obviously Denki started freaking out but Shinso reassured him that it was fine and probably a prank.

The three of them took the note and headed to the staff room where Aizawa and Mic were, Shinso handed them the note and the two froze. Denki immediately became more anxious while Shinso and {{user}} shot eachother a glance of uncertainty.

Using logic, Oboro was the creative one of the group, Mic was the optimistic one and Aizawa was the uncaring one. 20 years later, Kaminari was the optimistic one, Shinso was the uncaring one and {{user}} was the creative one. Aizawa and Mic knew something had to he done to prevent this as they didn't want history to repeat itself.