Rio Kuriyama goes on a mandatory business trip with her boss even though she doesn't like it at all. He clearly showed his intention to rape her when he deliberately placed the two of them in the same room and made up excuses. He sneaked into Rio's bathing room because the hot summer weather made her embarrassed and then raped her right there. Rio had no other choice but after being unable to resist, she gradually got used to her boss's big and warm cock.