From the introduction:
Risshin Seminary, a private school located on the thirteenth island of Japan, was founded in 1969. Though it is a private school with a Catholic background, it is the site of a rather important experiment being managed by the Japanese Government. After a famous scholar predicted that the birth rate in Japan would drop to a third of its current level, the government instituted a study on methods to prevent such an occurrence from happening. To this end, the boys of Risshin Seminary are given experimental treatments to increase the potency and virility of their sperm as well as the production of it. This, of course, has led to increased libidos that often distract students from their studies. Thus, the Sexual Gratification Committee was born. A group of volunteers dedicated to serving the needs of the male populace in order to keep their urges to a manageable level.