The story of a man and a woman that extends over 30 years in the Warring State period.

Shun and Nagisa first meet and fall in love during high school. However, despite strong feelings, they go their separate ways. Years later, Shun is now living alone in a rural area when Nagisa arrives with his six-year-old daughter, Sora.

Hyakaou Academy is an institute where the academic ranking is based on the pupils' gambling winnings. Yumeko is new to the academy. Her pretty enchantress looks are only surpassed by her voracious appetite to gamble it all and win it all.