Usogui is a psychology- and gambling- based manga by Toshio Sako.
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 Kagerou referees these games as a neutral party. Follow Bak 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 to ultimately out-gamble and control the neutral organization of Kagerou itself.
Usogui provides examples of:
- Absurdly High-Stakes Game - The entire premise of the story.
- Batman Gambit - Bak uses his opponents' personalities against them. Q-Taro found this out the hard way when Bak recruited Marco during his battle with him. He used Q-Taro's belief that Marco was dead to lure him out and attack him with Marco.
- Catchphrase: "You are a liar", told by Usogui, mostly every time he is about to defeat his opponent.
- Gambit Roulette - Some of Bak's plans seem to be this. But he actually does try to learn everything about a target, down to their personalities, forces, and supplies they would have hidden in their building. Yes, he even plays roulette this way.
- HeelFace Turn - Marco joined Bak's side after asking Bak who he was. Bak's response: "That's something you must decide for yourself."
- Serious Business - Bak treats slots as such. But his entire life has been about life-or-death gambling, so...
- Super-Powered Evil Side - Do not stick a syringe in Marco.
- Trademark Favorite Food - For Bak: Japanese apricots. Eating one usually means he's about to do something badass.
- Xanatos Gambit - All of Bak's strategies are these. If an opponent calls his bluff, he reveals that it wasn't a bluff and wins anyway.