This project, which investigates the sexual desires of college students with the help of a college couple and their male friend found at a hot spring, is finally in its fourth installment! This time, we have a special big-breasted special! The mission that was secretly told only to her was, "100,000 yen for each time you have creampie sex with a male friend while your boyfriend is sleeping!" In this situation where you absolutely cannot wake up your boyfriend, the lewd body of this college girl becomes more sensitive to sex with her male friend! She shakes her breasts and accepts creampies over and over again!