For the first time, childhood friend Nana asks the timid man who has secretly loved her for years for a favor: join her and her boyfriend in a threesome. He hates the thought of watching her have sex with someone else, but cannot abandon her or risk her choosing another man instead. When the boyfriend casually says he is bored with sex with Nana, jealousy turns to fury. Seeing her apologetic, embarrassed expression only reminds him how adorable she is, and he decides to stop holding back, fuck her in front of the boyfriend, and steal her away for good.