One of the most underrated girl in Priconne. Unlike Makoto's straight up conflicting feelings between being Yui's friend and her loving Yuuki, Tsumugi's more convoluted because the connecting thread between her and Yuuki - that is, Rei herself, isn't overly infatuated like Yui did. Not to mention that Tsumugi's object of affection being Rei, so the ever-increasing feeling she had for Yuuki makes it even more sweeter.