The only daughter of a japanese mother and an american father, Karen is the second best friend of Ayako .

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(thanks to Rosalys for this)

A little over protective with Ayako at times, and a little jealous for everything else, she'll keep accompanying her at school when Shizuka will choose to go to another school. Karen is an athletic girl, with her tall height and her long legs which intimidate a lot of her classmates.

Karen arrived in Ayako's life about 3 years before the beginning of this story. She will meet Ayako when she'll be transferred in her class upon her arrival in Tokyo. She'll want to take care of her immediately at school along with Shizuka, without really telling why. Does she have something to hide?