Hello, I just remembered a one shot that i read a couple of years ago when I was addicted to mangas. It's a "survival" kind of manga where the protagonist is invited to participate in a game where you can kill your opponents. By killing them you can collect their "thing" and you can exchange it for money. As a deliquent the protagonist is immediately hooked onto that game as he turns out to be a pretty good killer. At the end he sees the player with the most "things" and thinks he can easily kill him to get a lot of money. The protagonist gets killed immediately by that player as it turns out that the best player is a girl with a killer dog that started this game to find the murderer of her father that was killed by a deliquent. Hopefully someone can help me to find this manga