1. Howaitonaitsu Aired: Feb 28, 2009 19-year-old Aika reunites with Eri and Karen to investigate the serial disapp...
2. E.T.A.I. Aired: Oct 26, 2009 Aika Sumeragi continues her adventures in an underwater world of the future.
3. Zero Aired: Dec 28, 2009 E.T.A.I. holds Aika captive and attempts to probe her, but the tendrils are b...