Aika R-16: Virgin Mission
Aika R-16: Virgin Mission is a Japanese three-episode OVA series animated by Studio Fantasia. Developed as a prequel to the Agent Aika OVA series, it was released on the tenth anniversary of said series. It takes place ten years prior to the events of Agent Aika and follows the story of Aika's first mission when she is 16 years old. The series was followed by a three-episode OVA sequel called Aika Zero where she is 19 years old. As with its predecessor, both series are known for their abundance of fan service in the form of panty shots and nudity. Aika R-16: Virgin Mission was acquired by Bandai Entertainment.
Plot
The mini-series follows 16-year-old Aika Sumeragi, who recently got her C-class license to be a salvager, a person who searches for treasure among the ruins of the Earth's cities which have been submerged following worldwide earthquakes. However, at high school, she is regularly late for class and then her posters advertising her salvaging services are taken down. However, one afternoon, she is invited by Eri Shinkai, the class president, to join her Treasure Hunting Club where they look for the coordinates hidden away in a tattoo on classmate Karen Minamino. Aika gladly accepts, but during the trip some of her schoolmates and even their club advisor attack them in an effort to try to capture Karen. Aika defeats the girls and discovers they are being controlled by some devices implanted in their bodies. As they approach the destination, Karen starts acting strangely as if she remembers being there before. At the underwater base, Aika, Eri, and Karen make their way to a locked lab, and discover Karen's true identity.In Aika Zero, 19-year-old Aika Sumeragi is called to investigate the goings on at a private Catholic school that is run by a council group called the White Knights. In the school, the students have been mysteriously disappearing and those who have returned have no memory of the event. They discover that there are aliens who use rope-like tendrils to probe the girls, knocking them out and harvesting their energy, or possessing them to do their bidding.
Characters
;Risako Nagisa;Gozo Aida
;Gusto
;Captain
;Miyu Shiratori
;Rin Shirakiku
;Kana Shiraishi
; E.T.A.I.
;Nina Hagen
;Rudolf Hagen
Episode list
The Aika R-16: Virgin Mission opening theme is "Sailing to the Future", while the ending theme is "Rise." Both songs were performed by Ami Koshimizu.The Aika Zero opening theme is "Flying Kid", while the ending theme is "Dream Hunter". Both were also performed by Koshimizu. Accompanying the second OVA series is a set of one-shot manga called Aika Zero Cutie, which features other adventures of when 19-year-old Aika is in college. The first installment was released on July 1, 2009, and the second was released on August 3.