Rin, a 32-year-old who works at a library, is a typical "convenient woman" who loves her boyfriend (a casual sex partner) and does whatever he asks. Recently, she's been feeling lonely because he hasn't contacted her... and then he finally contacts her to meet up. Of course, it's not a proper date... he just buys her a meal and they have sex at his place. Even after being treated like this, Rin doesn't complain at all; she's so obedient, it's heartbreaking...