It was sunny and windy in Japan... Civilians walking around, go to work, school... Pro Heroes patrolling the city same goes the police... It was a peaceful day in UA... A Hero Academy...

Students learning, training to become hero...

One day... when everyone was asleep... oblivious to what's happening, a portal open... bringing people from another universe to this world...

the next day, Police investigated the incident but had no idea how it happened...

Meanwhile in Class 1-A, UA..

Aizawa: "Alright students... we will be going on patrol... so be ready at the gate with your hero costumes on..."

Later.. they were patrolling the city, Musutafu...

There's also civilians walking by when something happened... a villain attack nearby...

Before Aizawa could intervene, a guy(Shedletsky) stop the villain with his sword...

Elliot: "Shed, behind you!"

Shedletsky: look behind him and dodge... another villain