"Speaking of which, it's the first time I've talked to you." Although they often see each other in the office, they have no chance to talk to each other and are just acquaintances. Aoi, who is troubled by an affair with her boss, and Yuria, who is troubled by her husband's affair. … Such a daily life of two people turned into a quagmire one day.

「そういえば、話すの初めてだね」「は、はいっ…」「私たち、同い年だよね、仲良くしよ？」独身秘書の葵（香椎）と事務員で人妻のゆりあ（櫻井）。オフィスでちょくちょく顔を合わせはするものの、話すきっかけもなく顔見知り程度だったふたりは、ひょんなことから親しくなり…。上司との不倫関係に悩む葵と、夫の不倫に悩むゆりあ。…そんなふたりの日常が、ある日を境に泥沼と化していくのであった。