Chikan no tesabaki: Sukebe bijo no aegigao (2008)

At the Kijima Physics Research Institute, researchers are relentlessly pursuing the ambitious goal of making materials transparent. However, the institute consists of only three people: Director Kijima, researcher Itsuka, and the handywoman Kunio. Kunio, who secretly harbors feelings for Itsuka, has already committed acts of molestation against her in his fantasies... Around this time, the research on transparency is nearing its final stage, and Kunio decides to become a test subject for Itsuka.