Tsukihi Araragi. The younger of Koyomi's two younger sisters. Born in April, 14 years old, currently in second year of middle school. One of the Fire Sisters. Blood type B. A hysteric, sly, prone to heights of emotion... and an immortal. This is the story of another fake. August 14th, Sunday morning. Regardless, Koyomi insists Karen to divulge any contacts of those who bully her, and Karen simply comments that her brother is hotter than fire sometimes. Karen flies across the room and into Koyomi's bed, performing a perfect landing befitting of an Olympic gold medal.