Aika, now 19 years old, continues her story three years after R-16 and seven years before Agent AIKa. Mysterious instances have been transpiring at a young ladies' academy where, one by one, the most charming and gorgeous girls become members of an internal club. However, instead of a sing-in, these girls are taken hostage by a strange being that uses indecent means to control them. Coincidentally, Aika was flying by in her plane when one of these abductions took place. She was attacked to prevent her from getting closer, but instead of dissuading her, she becomes intrigued about the attack's origin. The opportunity arises when her late partners from R-16 decide to look into these abductions. The story remains packed with action and provocative displays that are customary in the Aika series.