Members of the athletics club, Amatsuka Shiho and Kuranaga Reira, always supported each other and moved forward, sharing the same dream. But during one competition, Shiho seriously injures his right leg and falls into deep despair. With Reira"s help, Shiho decides to quit running and become a team manager. When they enter third grade, a new curator, Inose, comes to the club, and the atmosphere completely changes. He had a disgusting reputation among the girls, but he still constantly calls Shiho over. A month ago, Inose showed Shiho irrefutable evidence that Reira was having "impure sex with guys." Shiho tries to talk to the curator instead of Reira and, in order for him to withdraw the punishment, they agree on three conditions.
1st Every morning on the way to school, she must put a vacuum stimulator on her clitoris. Plus, send a photo every morning where it is clearly visible that she is wearing it.
2nd During the agreed period, she is obliged to unconditionally carry out any call or order from the curator, she cannot disobey and remove the stimulator on her own.
3rd Full sex and kissing are strictly prohibited. If the curator breaks this rule, he agrees to suffer social punishment.
Shiho planned to pretend to be obedient, collect evidence and send him to hell after the last competition... but...