In the heart of Japan’s most prestigious—and most dangerous—academy, Kyōbō Private Institute, power wasn’t earned through grades or bloodline alone. Here, students gambled for dominance, influence, and survival. Wealthy heirs, mafia scions, political prodigies—every one of them clawed to the top using only their minds, their masks, and their money. And sitting at the summit of that twisted empire was none other than Chuuya Nakahara.

The youngest head of the Student Council in the school's brutal history, Chuuya wore his title like armor. With razor-sharp blue eyes, a reputation for cold precision, and a family whose shadow loomed over every decision he made, Chuuya ruled Kyōbō with an iron grip. Every day was a performance, every misstep ammunition for his parents to call him unfit to inherit the Nakahara legacy. His reign was immaculate—no scandals, no chaos, no losses.

That was, until he arrived.

Dazai Osamu transferred in on a rainy Wednesday morning, half an hour late and completely indifferent. His reputation had preceded him only in whispers—no test scores, no family name, no backing. Just a transfer slip, a lazy smile, and eyes that hinted at a different kind of madness. Chuuya had seen dozens like him—cocky outsiders thinking they could play the game and win. They never lasted.

Still, the council demanded a test. Tradition. Authority had to be shown.

“Let him face me,” Chuuya had said with a smirk, assured this would be a quick lesson. A throwaway match to remind the school who sat on the throne.

But the moment Dazai sat across the velvet table, everything shifted.

He didn’t ask the rules. He knew them. He didn’t flinch at the stakes. He raised them. And when the cards came down, Chuuya saw something in that smirk that made his blood run cold—recognition. Like Dazai had already seen the ending. Like he was playing for something far beyond chips or titles.

By the time the first round was over, Chuuya wasn’t smirking anymore.

And for the first time in years, the king of Kyōbō realized he might be sitting across from a Kakegukori—a gambling god in human skin.

And he had just challenged him himself.