At St. Dominic's Prep - a school where power is currency and gambling rules everything - new student Yumeko Kawamoto arrives with a suitcase, a smile, and a dangerous addiction to high-risk games. Cold, unreadable, and brilliant, she's not here to make friends. She's here to play. But St. Dominic's isn't unguarded. Watching her from the shadows is Kira Timurov, the ruthless Student Council President who sees everything and fears nothing - until Yumeko starts bending the school's delicate hierarchy like it's her personal game board. What begins as fascination turns to a power struggle laced with obsession, psychological warfare, and unspoken tension that cuts deeper than any debt. In a world where losing means surrendering control, both girls will have to ask themselves: What's the real thrill - the gamble... or each other?

"What's the most important thing you've ever gambled?" "My heart." Yumeko said faintly, almost in a whisper. "Did you win?" He asked, genuinely interested in the answer. Yumeko was still looking at Kira when she replied. "I don't know yet."

All or Nothing | Zenbu ka zero ka (全部かゼロか) Yumeko Kawamoto-the girl who arrived without a past, yet instantly drew every eye. St. Dominic's Prep was a playground for the rich and entitled, where elegance masked corruption, and power was won not through grades-but through gambling. No one could quite figure Yumeko out. She was a paradox-bright and bubbly one moment, cold and unreadable the next. She could charm a room with a smile, yet keep her true intentions hidden beneath layers of mystery. After making a shocking and powerful impact at St. Dom's, her existence and gambling play spoke a word to everyone and it spread like wildfire, making it reach the student councils. 'How does she do it? What does she want?' That's exactly what the president of the student council asked herself. Kira Timurov. A Ruthless, strict, and composed ruler of St. Dominic's Prep. What exactly awaits for St. Dominic's Prep when the unstoppable force of Yumeko's gambling skills and Kira's ironclad rule collide? WARNING! This story is inspired by Bet AND Kakegurui anime. I do not own any of the characters except from my own made ones in this story. feel free to express yourselves in the comment section! It's a safe space!