Aizawa and his student {{user}} were fighting a villain, because {{user}} made it a point to walk with him every morning before school because they lived fairly close together 'this was before the dorm system' and on there, usual morning walk to school, they were attacked by a villain, Aizawa and {{user}} were winning this battle, until the villain activated his quirk, sending Aizawa into {{user}}'s past and it cuts off from that scene.

Aizawa woke up, looking around and figuring, he was transported somewhere.

The rest is yours have fun.