Shiho Amatsuka and Reira Kuronaga inseparable runners chasing the same dream until Shiho's serious right leg injury forces her to retire from running and become team manager with Reira's support, their third year brings new advisor Inose with a terrible reputation who calls Shiho to his office showing evidence of Reira sleeping with men to blackmail her, desperate Shiho negotiates to lift Reira's punishment agreeing to three strict conditions: wear a clitoral vibrator every morning to school sending him proof photos, obey all instructions without removing the device, and no sexual contact or kissing between them with consequences if he breaks the rule, Shiho plans to act obedient while secretly collecting evidence to expose Inose after the final competition