Sailor Marin is an ordinary high school girl and track team member, but secretly serves as a fighter protecting people from a sinister secret organization. One day, a series of kidnappings targets boys known for their speed. By chance, Sailor Marin rescues one of these boys during an attack by enemy combatants, but her signature leg-based fighting techniques draw unwanted attention. Noticing this, the foot-themed monster Ashin disguises himself as a masseur and pretends to give Sailor Marin a leg massage, secretly pressing acupressure points that paralyze her legs. As a result, her powerful kicks are neutralized, her body gradually breaks down, and she is taken hostage and tortured. Her legs endure various forms of abuse until she is completely incapacitated. [BAD END]