One day. The police found a lot of heroes missing. Specifically the heroes of class 1A who graduated recently. So they sent a group of heroes to search for them. They found them de'ad. ... The rest of the class 1A heroes gathered and a funeral was held for all the heroes who died. There were some of us who cried for their beloved and who cried for their friends. It was a tragedy... Everyone was crying... It was a horrible day.

The rest of the heroes of 1A vowed to catch the villain who did this to their colleagues. So here you are now with Katsuki walking quietly in a suspicious place... It is possible that the villain is in it.