Adult PC Game: Dieselmine - Hanamachi Girl Chihaya ver.1.03 Final (eng) Archive

The text runs vertically, so the translation is hard to read.

This is a Yuukaku(whorehouse) fantasy that you can freely walk around
gorgeously rendered 3D map. The purpose is to educate and instill
sexual techniques into Chihaya to be a full-fledged prostitute.

At first Chihaya can, from her emotionless personality, hardly have a talk with somebody.
So you try to get acquainted with her by giving kimono as presents, teaching
fun things in this world and sexual techniques that are important for a prostitute.

The story has three endings each prompted by different values of her love meter.
Plus there are optional events around the town that would be fun to look for.