Btooom!

Btooom (ブトゥーム) is a Japanese manga written by Junya Inoue and serialized in Weekly Comics Bunch and later in Monthly Comics Bunch.

Story
Sakamoto Ryōta is an unemployed 22-year-old who lives with his mother. In the real world, there may be nothing really special about him, but online, he's one of the world's top players of the combat game "BTOOOM"!

One day, he awakes in what appears to be a tropical island, though he has no memory of how or why he has come to be there. While wandering around, Ryōta sees someone and calls out for help. The stranger responds by throwing a bomb at him! Now Ryōta realizes both that his life is in danger and that he has somehow been trapped in a real-life version of his favorite game! Will Ryōta be able to survive long enough to figure out how and why he ended up here?

Main Characters

 * Ryōta Sakamoto - (CV: Kanata Hongou) He's currently a 22 year old unemployed man who is addicted to a video game called Btooom! After working as an intern over at Tyrannos Japan, the company that makes Btooom!, in hopes of getting his dream job, he finds himself stranded on an island without any recollection of what has happened to him. He quickly has to fight for his life when anyone is gunning for each others' chips by killing 7 players to get off the island.
 * Himiko - (CV: Suzuko Mimori) She's an average high school girl whose life was ripped asunder after the incident when her friends were raped by Yoshioka and his band right in front of her. She finds herself nominated by her best friend to disappear on Btooom! island.

Official

 * Btooom!'s Official Website

Other Sources

 * Anime News Network
 * Wikipedia