A summer afternoon hit by heavy rains due to the recent abnormal weather. Teacher Ooki and his student Rin, who happened to be with them, decided to take refuge at his house, soaking wet. As Ooki rubs Rin, who is shivering from the cold, to warm her up, he becomes aware of her transparent, developing body and feminine softness. Rin smiles innocently at Ooki and leans closer to him, saying, "Hey, teacher, I stayed after school every day so I could go home with you."
