Yuki, a student who goes to a cram school, is worried about his stagnant grades. The reason for his poor grades is that this spring, his world history teacher has been changed to Airi. She is beautiful and a good talker, and he is so mesmerized by her that he can't concentrate on his studies. Airi-sensei also seems to be worried that it is his fault that my grades are not improving. One day, a friend introduces me to a recommended delivery health service to help me change my mood. He opens the website thinking it will be just once, but there is a beautiful woman named Ai who looks just like Airi-sensei. Yuki is skeptical, but he chooses Ai...