A high school girl who is best friends with Haruka, agreeing to help her get closer to Tomonaga. A secret child prodigy that doesn't get many opportunities to test and branch out her knowledge, she displays great interest in Tomonaga's research materials, showing no hesitation to get her hands on books in order to expand her knowledge and learn new things, even if they're in a different language. She hides this aspect of herself, however, holding back in her academics, content with receiving normal grades so long as no one (besides Tomonaga) finds out how smart she really is.