Nono and Lark board a satellite base, Meganebula, where the members of "Fraternity" gather. Nono is excited to be able to fight alongside her longing sister. Nicola is interested in Nono's performance and sets up an experiment on Nono. Lark heads for the space battleship to be interrogated by the inspection force for the battle ahead. However, at that time, a space monster appeared again in the Mars space!