Do you know? The existence of the "Penis Research Institute Foundation" located in a nondescript residential area. The director, SM queens, foreigners, lolita girls and other unique researchers are seriously and purely researching penises every day. One day, the time is ripe to carry out the crucial "experiment", and you are called in as the test subject. With the serious purpose in mind, you will be toyed with to your heart's content in the sexual intercourse research group, where even contraception is not allowed.