Uniform Gals: Underwear Encyclopedia (1992)

At the Asami Planning office in a corner of a rundown multi-tenant building, manager Inada is having sex with nurse Saya Hanyu in the middle of the day. Then Asami returns with Sachiko and scolds Inada. While traveling in Kyushu, Asami happened to be on a tour bus with Sachiko as a guide, and fell in love with her singing voice, so he forcefully scouted her.