"Win 100 times and you're free. Lose three times and you're immediately disposed of." No one has ever made it to the surface, and Tora fights in a brutal underground arena. He's just one win away from freedom, but the match prepared for him just before his release is a fated showdown against his rival Kano, who has also risen to 99 wins and 2 losses!! Win or lose, it's the final match, a battle for his 100th win... But what a surprise, a simultaneous knockout results in a draw!? While waiting for his punishment at dawn, Tora lists "sex" as something he wanted to do on the surface, and Kano pushes him down, saying, "Well, you can have sex then"—? On the last night of his life, Tora and his former rival explode with survival instincts in this BL story.