I'm currently listening to Kimi no Shiranai Monogatari by Supercell. Here's the link:http://www.youtube.com/watch?v=7RQtoX1yTrY&feature=related

Chapter 3: The strange apartment complex...

When I walked into my living room, Hiroki was still standing in-front of the door. "You can go in if you want.." I said. "...Alright." He said and took off his shoes and put on house slippers and stepped into my living room. I sat down on the left side of my couch and Hiroki sat down on the opposite side. "So, Who are you and Why are you my servant? I never asked for a servant." I said and crossed my arms. "When someone new decides to live in the apartment complex, a servant is provided. All the tenants that live here are all rich, and there is something special about them. They're all descendants of Youkai's." Hiroki said.

"...So I'm some sort of descendant of a certain type of Youkai?" I asked. Hiroki nodded. "We servants are part of the SS. We are to protect our masters. Which are the tenant's that live here. Tenants like you." Hiroki said. "...Protect us,huh?..Fine. I heard a lot of strange rumors about this place anyway." I said. Hiroki stood up and asked "Shall I give you a tour of the building?". I nodded and put my shoes on.

That's all I have so far. I have to watch the first episode again to see the structure of the building.