The story follows Masaoka Masahiro, a teenager known in the underground mahjong world as "Ma-bou", as he plays progressively higher stakes mahjong matches, outsmarting most of his opponents by unorthodox strategies, psychological manipulation, and cheating.

Hazakura Furukawa is the most popular girl in class due to her conservative attire and pure, innocent appearance, like a literary character. On the other hand, I'm a guy who is shunned because of my lazy demeanor and unkempt appearance that makes me seem like "a guy who hits on girls," even though that's not what I'm really like. But then, Hazakura said, "Rihito-kun made me a real woman!" And with those words, Hazakura transformed herself completely! "Rihito-kun is stylish, cool, and stays true to yourself without caring about what others say… You're exactly the kind of guy I like!" Although I was embarrassed at first, Hazakura maintained her new, bold attitude, saying, "I just want to experience love like everyone else." As my relationship with her deepens, the way the class treats me also starts to change!? (Source: Kadokawa, translated)