Risako Nagisa (凪紗 りさこ Nagisa Risako ) is a teacher of the school Aika attends who first appears in AIKa R-16: Virgin Mission.
AIKa R-16:Virgin MissionEdit
She is also the advisor of Treasure Hunting Club. She turns out to be an enemy, having controlled three of the students with electronic devices to attack Aika and Eri and also tried to take Karen away. Her true identity is an agent from a mysterious organization sent to observe Karen.
She returns as a teacher to help Aika and watch over Karen.
In AIKa R-16: Virgin Mission she has multiple outfits. While school she dresses relatively conservative, outside the school she prefers skimpy clothes like Neena Hagen. In AIKa Zero she wears a lab coat due to her undercover role as a school nurse.
With help from Karen, Aika manages to defeat Risako in episode 2, Peach Peach Beach, still having quite some troubles and finding her a very difficult foe. Once she is beaten, her hands and feet are hastily tied to keep her under control. Still defiant and apparently unmoved by her defeat, Risako refuses to give any information, warns them to stop in their quest and tells them they are being overheard and reinforcements for her will soon arrive. Her arrogant attitude is cut short, however, when Karen unexpectedly pulls a gun on her and unceremoniously shoots her with a tranquilizer dart from short range. Risako makes a loud moan and her voluptuous body crumbles to the ground unconscious. There, Karen partially removes her skimpy bathing suit to reveal a transmitter, Risako's trump card. Without any chances of now receiving any help, and thus being no threat, Risako's body is carried by Gusto to the ship, where she is left with the other captives in the deposit, restrained by several belts in such a way she can hardly even move. We can assume she remains like this for the days it takes for the mission to be over, probably taken care of, in her practically inmobile state, by the ship's crew.
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