I Won't Sleep With You For Free summary: Miyako Kirishima, a university student with a desire to become a teacher, lives a frugal lifestyle despite being impoverished. One day, she dines with her friend Yui Nakano, whom she occasionally tutors. Upon leaving, Yui extends an invitation to a love hotel, but Miyako is hesitant due to not wanting to engage in sexual activities with a friend. Unexpectedly, Yui offers her ¥30,000 as compensation. Miyako's encounter with Yui leads to similar "transactions" with other friends at their women's university. This sets the stage for a story of yuri, friendship, money, and sex.