I read a manga last year (I think it was last year ^^) and want to read it again, but I forgot the title. I hope you could help me find it.
It's about a guy who got dragged into a showroom or something like that with a big stage. They were being tested by a person, and had to win games in order to survive. They used cell phones.
I think the main character was playing a social game or something like that, in which you could make friends. He had a lot of virtual friends with whom he could talk about his problems, because he didn't get along with people in real life except for his sister. All other humans who weren't dragged into the survival game could watch this whole spectacle from a TV in the city.
The first part of this game was that the people outside this game could cancel their friendship with the people in this room, but if they cancel their friendship with them, the participants die immediately. The people outside the game would also die if the people in the survival die.
This is as accurate as I can remember. I hope somebody might be able to help me.