Saegusa Yukika is the student in the same high school as Rin and also her classmate. She has two close friends: Makidera Kaede and Himuro Kane. They are known in their school as "The Trio" and are inseparable. Yukika is very bright and intelligent girl, the youngest in the class. She's only 15 but because she has good grades, she was allowed to start high school a year earlier. Yukika is a shy girl, the one that probably respects and worships Rin the most. She's very affectionated to her three younger brothers and she spends lots of her free time in looking after them. Yukika is also the manager of the Track Team and warmly loved by the majority of her class.