Nanami works as an office worker at a small advertising agency. In this company where only men work, sexual harassment-like remarks are common. When it suddenly started raining, Nanami was discovered by those around her that she wasn't wearing a bra, and she started to be teased by No Bra-chan. "Hey, you know, just because you don't think people treat you like a woman, you're not trying to attract attention by coming to work without a bra. Don't you think that's a bit much?" While working overtime alone, her boss massages Nanami's shoulders and gradually moves his hands down. "Your nipples are rubbing against them, aren't they?" And so began the days of her boss' nipple harassment.