Darwin's Game

Darwin's Game (ダーウィンズゲーム) is a manga written and illustrated by FLIPFLOPs. It has been published in Bessatsu Shounen Champion since December 12 2012.

Plot
The life of Kaname Sudo changes when displaying a message on his cell invited to participate in the game. As soon bitten in the neck by a virtual snake popped up on the screen, it is now the slave of a competition ruthless, the "Darwin's Game" true urban arena in which participants interconnected via a social network to compete in duels to the death.

Very quickly, the high school has to go to the obvious: even if he tries to escape the game, opponents, attracted by the lure of money and the thrill of the fight, are desperate to find him.

Other Sources
Japanese wikipedia

Other Wikis
French Wiki