Well, the dude in the trench coat is being a total jerk so far -_-

Besides that....

I bet a lot of you have enjoyed Sebastian's presence, but can't help but question it at the same time :P

I don't want to reveal too much right now, so all I'm going to say is that Sebastian and his dad DO relate to Inuyasha in some way.

But you have to keep reading to find out how :3