AIKa ZERO

Aika, 19, reunites with friends Eri and Karen to investigate the mysterious disappearances of girls at St. Aero Academy. While undercover, they uncover the student council, the White Knights, who are collaborating with an alien entity using light-like tendrils to abduct students. Aika is captured by the alien but is later rescued by Risako.

Miyu's past with aliens is explored, showing how it led her to recruit classmates into the student council. As the army takes charge of the investigation, Karen goes undercover and finds the council missing from the chapel, while the Hagens watch their activities. Aika launches an underground raid after the White Knights capture more girls.

Aika is captured by E.T.A.I. and subjected to probing, but her innate power disrupts the process. After defeating Rin and Kana, Aika reunites with Karen and Risako, rescues the captured girls, and ultimately defeats Miyu and E.T.A.I. With military assistance, Aika helps destroy the alien spaceship and returns safely. In the end, Miyu and E.T.A.I. are captured by the Hagens.