Mecha Gishi Resta no Daibouken

Based on the erotic doujin game by Resta!.

Resta lives happily as an inventor in a small city. But her normal life is shattered when the robots around town go berserk and begin wrecking everything in sight. It's up to Resta and her good friend Curie to uncover the truth behind the incident and put an end to the chaos!

(Source: Steam)