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Ganriki! After School Fascination

Chika's eye power has the ability to charm men and make them do her bidding. However, she cannot use it as well as her sister.
She wants to use it not for lewd purposes like her sister, but for the good of others, and when she hears that a pervert appears at school late at night, she is determined to solve the problem,
She is determined to solve the problem. What is this "professional" pervert whose true identity has not even been revealed to the security guards?
Will Mika's eyesight be effective against a professional pervert?
And what is the true identity of the professional pervert?