However , during their voyage they are attacked by some of the club members who try to kidnap Karen , and are revealed to be controlled by their club advisor Risako Nagisa .
Accepting the offer , Aika joins Eri and Karen aboard her private cruiser .
During their voyage they are attacked by some of the club members who try to kidnap Karen , and are revealed to be controlled by their club advisor Risako Nagisa .
Accepting the offer , Aika joins Eri and Karen aboard her private cruiser .