Chimimouryou

Amatsuka Shiko and Kuronaga Reira, members of the track and field club, have always supported each other, moving forward together and sharing a single dream. However, during a competition, Shiko seriously injures her right leg and becomes despondent. With Reira's support, Shiko decides to give up running and become the team manager instead.

When they start their third year, a new adviser named Inose joins the club, completely changing the atmosphere. Despite his terrible reputation among the girls, he frequently summons Shiko to his office. A month ago, Inose showed Shiko "proof" that Reira was having sex with men.

Shiko tries to speak to the advisor on Reira's behalf, hoping he will lift the punishment. They agree on three conditions:

Every morning on her way to school, Shiko must wear a clitoral stimulator and send a photo clearly showing that she is wearing it.

For an agreed period, she must unquestioningly follow any instruction from the advisor and is not allowed to remove the stimulator herself.

Any form of sexual activity or kissing between them is strictly forbidden. Should the advisor violate this rule, he agrees to face social consequences.

Initially, Shiko planned to pretend to be obedient while secretly gathering evidence to expose Inose after the final competition. But...