Rena, a member of the track and field club, hates her advisor teacher, who is prone to bullying and whose guidance is bordering on sexual harassment. One day, despite the heavy rain that began falling in the evening, Rena is ordered by the teacher to stay after school. The storm becomes more serious and she and the advisor teacher are unable to go home. Rena's body is soaked by the heavy rain, and her underwear is visible through her uniform, and the devilish teacher becomes aroused and finally crosses the line and sexually assaults her. Rena is humiliated by the perverted middle-aged teacher, who continues to torture her all night long...