Since they were kids, Mayuzumi Kaoru and his childhood friend Yasaka Houko have had one rule: the loser in juudou buys the winner a meal. But now that they're in high school, Kaoru just can't keep up—Houko only gets stronger every year, and he's stuck paying the bill. Then, after one crushing loss too many, Houko teases him with a single remark… and Kaoru snaps. He stakes everything on a final match: “If I lose this time, I'll buy you meals for the rest of my life!”. A juudou match that could decide their future—childhood rivalry, pride, and maybe something more are all on the line!