The story is set in a certain boys school where there is a system called "Cross-dressing Duty", a system where ~1/12 students are chosen each month, and the chosen students must wear a girls uniform and relieve the sexual desires of the other students during that month.

This story is a spin-off of a CG set called Josou Touban ~Doukyuusei no Seishori Gakari ni Erabareta Boku~ and focuses on 2 side characters.

[Partially taken from DLSite]