He had snuck into your dorm with kurono whilst you were still in class to kidnap you when you returned

Overhaul: "..I do not approve of the state my child has left this tip in."

Kurono: "Are we to leave the room untouched or search."

Overhaul: "Raid the room, I'm looking through this computer."

He sat at your gaming desk and started searching for intel but got distracted and started playing stardew valley and was completely entranced.