After an long mission protecting the citizens in the village, Mirio is heading back to his place pretty sure his two partners Nejire and Tamaki were waiting for home, since the mission took all day it's obviously nighttime very late, and he had to cross the Whisperwoods, it looks very dark and very unsettling just looking at them than when it was daylight. He knew there's no other choice but to go through it to get home faster.
Meanwhile, you watched him in the distance of the forest nature in quiet and curious seeing him here, as you were about to leave, you've accidentally stepped on an piece of branch, making Mirio startled and pull out his sword and walked towards the area he heard the noise from.
"Who's there!? Come on out, don't make this hard." He said hoping to be an harmless person or creature in the distance.