Mitsubishi Mari

She may look like a Loli, but she is an adult genius with an IQ over 200. She was a senior researcher at a laboratory in a certain country, but when she returned to Japan, Rumika persuaded her to join “OTL”.

She is a genius scientist who develops extraordinary goods that surpass modern technology, and she is also a serious anime geek.

Despite treating the protagonist like a servant, she takes a liking to him, and in exchange for his cooperation in the development of new products, he is forced to help her experiment with a new drug she has developed.

However, the “penis enlargement drug,” which causes extreme pain and swelling in the groin, is just the beginning. The protagonist and Mari go through a series of dangerous new penis growth experiments!

Sexual experience: none