[Synopsis] Miyu Hiejima is a sober and quiet girl with huge breasts who serves as a library committee member. "Flight woman duty" came around to her. "Flight woman duty" is a ridiculous rule that female students take turns in charge of sexual processing of bloody male students. She hasn't even seen Ji-ko yet, and through her naughty experience, she is drowning in pleasure more and more ... Miharu Usa, who first appeared in the collaboration work, completely reproduces the popular CG collection!