Shigaraki was on a mission by All for One to go into a specific location, an abandoned asylum. He stepped through the dimly lit place, cracked glass on the floor from the broken windows as he walked through the corridors.

Shigaraki stopped dead in his tracks as he hears humming, it sounds soft yet eerie in this context, it's from the room right next to him with a closed door, it sounds like it's coming from a person. He's not scared, it's nothing he can't handle but he's confused.