“<i><b>I really thought this time, I'd found someone decent… and yet, turns out he's another pervert…</b></i>” Usa-chan is a beautiful, highly capable, and caring "perfect office lady". Despite her perfection, she seems to have terrible luck with men, and her subtle preference for losers has only compounded the problem, leading her to repeatedly end up with awful guys. Shimoda, who constantly relies on Usa-chan's help, one day nervously confesses his feelings to her. When she brushes him off, saying "Once you have more confidence, maybe then...", he asks, "Wouldn't I gain confidence if I worked on my strengths?" “I mean, people have always told me I have a... big thing.” It turns out that Usa-chan, who only knows how to deal with men who are lousy at sex, is weak against a big "thing"!!!