Liar Game 2 by Shinobu Kaitani

Pulled deeper into a high-stakes psychological tournament, an impossibly honest young woman partners with a brilliant ex-con strategist for a ruthless “minority rule” round where only those who choose the less popular option win. As a manipulative rival exploits paranoia to hoard advantage, fragile alliances crumble and betrayals mount. Balancing cold-blooded tactics with a radical, cooperative plan to spare everyone from crushing debt, the duo twist the rules, outmaneuver their opponents, and push the group toward an outcome that tests whether trust can survive a game built on lies.