Koiro-san (pseudonym) works in sales at a life insurance company. Due to her job, she frequently seeks encounters in various situations, using clever tactics such as secretly filming upskirt pantyhose shots on trains to initiate contact. As a result, it's not uncommon for her to lure men back to her place and engage in full intercourse. Even before securing a contract, her enthusiasm knows no bounds as she aims to deepen relationships by achieving creampie orgasms deep inside her vagina.