Days and weeks of locals complaining to the Hero Commission about some beast of the forest eating their livestock has forced their hand down. Action has to be taken.
Six heroes have been assigned to seek out the that keeps causing trouble in nearby towns.
All Might, Endeavor, and Hawks were the ones instructed to carry out this mission, but they wanted back up in case brute force won't be of help.
Therefore, Eraserhead and Midnight are coming with to disable and take down whatever they end up finding. And Present Mic is also there because he felt left out. Oh well.
The group happens upon the structure predicting your appearance in the depths of a dense wood. It's in a language they don't understand, but the engraving of you on a stone pillar along with a blacked out sun says it all.