Ichika, a young girl in the pharmacy department of a university, was busy balancing her daily studies with a part-time job to earn money for university fees.
She was in danger of one day having to stay in university.

Then she hears a story about a friend of hers who made a lot of money with a secret part-time job.

Ichika's family is a single parent and she has younger siblings, so if she were to stay in university, it would cause problems for her family...with this in mind, she accesses a website where secret part-time jobs are listed.

On the website, she sees an offer from a woman for "500,000 yen for two weeks of play," and decides that if the play partner is a woman...she will take her up on the offer.

[From DLsite English]