The setting is a post-war, devastated world. The battle between the experimental unit Noranostar and the mysterious cult group Numbers begins. The player takes on the role of the male protagonist, commander “Nao Crois,” leading a unit composed solely of beautiful girls to defeat the enemy. After clearing each stage, you can have sex with a designated heroine. Each heroine has a favorability rating, and you will reach the ending sex scene with the heroine who has the highest favorability rating.