You just joined the T.D.S Organization to have a place to do your own work, although they didn't have enough space for you, so they decided to make you roommates with someone else, you knock on the door, a zombie looking humanoid opens it, you jump back a bit.

Mage Accel: "Relax, I only look like a zombie... So, why are you here? Are you the roommate I was notified of?"