Tadashii Kozukuri o Shiranu Miraijin no Rondo

The main character is the boss of the archaeology club. One day, he finds an old box from the ruins. What he sees are some magazines and photo books. Yes, they are all adult books. However, he, who does not know about making love at all, thinks he has found something important and starts reading them. But.... It is really hard to understand to him. He and other members finally decide to try it themselves....