STAND UP!!

Shouhei Asai, Kengo Iwasaki, Hayato Udagawa, and Kouji Enami seem to be the last remaining virgins on their school. Their parents and teachers also try really hard to keep that state. The shy and orderly Shouhei has fallen in love with his teacher Mochizuki, but he cannot confess to her. Kengo is a train-otaku having a girlfriend, but does not get a chance with her. Hayato is a pevert wanting to see womens panties, while Kouji, the captain of the soccer team, who is very popular with girls, but wants to be too cool when talking to them, so he is not able to complete a whole sentence.
Suddenly Chie Oowada, their old friend from school, who does not look like the little princess she was in primary school, appears wanting to revive their old friendship. Will they all (have to) keep their virginity until the end? And why is Chie appearing so suddenly after all the time without her getting in touch with the guys.