Akina is a female college student who studies hard to become a teacher loved by her students, but her father's company is on the verge of bankruptcy, and she has to raise the money for her own school fees. Looking for a part-time job, Akina goes to a private tutoring agency for advice. She doesn't realize that the agency is a den of evil that selects only beautiful women, skillfully lends them money, and then forces them to provide sexual services to male guardians...