A sudden downpour left Yuichi trapped alone in his office during overtime. Just when he thought things couldn't get any worse, his female boss Iori arrived drenched from the rain. Their train had stopped due to the heavy storm, leaving them stranded together with their mutual crush. In the heat of passion, they lost all sense of reason and indulged in non-stop SEX throughout the night, fueled by sweat and lust.

突然のゲリラ豪雨で1人オフィスに閉じ込められてしまった残業中の伸一。そこへびしょ濡れになって駆け込んできたのは女上司のいおりだった。雨の影響で電車が止まってしまい、憧れの先輩と2人きり。つい理性の糸が切れてしまったのは先輩も同じだったようで、雨と汗にまみれながら貪ように朝までSEXしまくった。