Badminton club advisor teacher, humiliation through a skirt

Haruka, a badminton club advisory teacher, had an affair with her colleague Ishida. Although she started dating without knowing that she had a family, even after finding out, the relationship continued... Haruka had become a convenient woman. One day, student Yoshii witnesses this "relationship between two people that should not be known to anyone." When Yoshii learns that her beloved Haruka is having an affair, he uses this as a joke to force Haruka to have a physical relationship.