Keiki Kiryuu  

, 桐生 慧輝

Keiki is a high school student in his second year, working as a library assistant and participating in the calligraphy club. during his duties at the club room, he discovered a love letter and matching panties that had been left behind by an individual known as "cinderella." now, keiki is on a mission to locate this mysterious person who has shown interest in him through these items.