A former track-and-field girl, Miku used to shut off her peers, until she met Hibiki; her ray of sunshine. Retiring from track-and-field - and fitness altogether - she became her girlfriend's live-in caretaker. Opening up to Hibiki, Miku quickly became a perpetual worrywart, with high-strung emotions and a bit of a jealous streak. Unable to become a gear-wielder like her girlfriend, Miku ended up getting pulled into all sorts of dangerous situations.