Usogui

is a manga written and illustrated by Toshio Sako. It is serialized in Weekly Young Jump.

Plot
There are gamblers out there who even bet their lives as ante. But to secure the integrity of these life-threatening gambles, a violent and powerful organization by the name of “Kakerou” referees these games as a neutral party. Follow Baku Madarame a.k.a. Usogui (The Lie Eater) as he gambles against maniacal opponents at games – such as Escape the Abandoned Building, Old Maid, and Hangman...