I remember the movie as japanese or at least asian. A group of very different strangers wakes up in a room. A naked woman appears lying on the ground, she is being teleported in and she gradually appears from the ground up. A guy gives her his jacket. The group puts on black, slim, leather/latex (?) uniforms and they have to fight a bad guy outside who kills some of them in a garage. I think the bad guy was the father of a little boy that the strangers met before in the streets. They find out they are part of a game and one of the strangers has done it many times before and they can only leave if they beat some sort of highscore.