A co-starring work between two major Obasan label exclusive actresses has been completed! Eiko and Chiaki are members of a certain mom's volleyball team. One day, after practice, the two were discussing a certain strategy while taking a bath. The strategy is to sneak into a ``training camp'' of a university student team that is mainly taught by Ishibashi, the coach of the Mama-san volleyball team. Then, on the day of the training camp... Eiko and Chiaki, who had successfully infiltrated the club, put aside their practice and started evaluating the young club members' dicks...