In Aika Zero , she serves as Karen 's guardian .
In Aika Zero , she participates in the St. Aero mission , rescuing Aika when the latter is first disabled by the enemy , and helping Karen and the gang in the follow - up investigations .
In Aika Zero , she serves as Karen 's guardian , and participates in the St. Aero mission , rescuing Aika when the latter is first disabled by the enemy , and helping Karen and the gang in the follow - up investigations .