Ishikawa, who runs a cram school with his wife, decided to let the students who did not improve their grades stay at home and teach them to study with his wife Yuri. However, the students' interest is in Yuuri's body, a fascinating instructor with huge breasts. The students who sneak into the couple's bedroom night after night like Yuuri's body and play with her as much as they want, and gradually Yuuri gets addicted to Kokomo's Jiko!
