Mizuki is a 16-year old female who is a first-year student at Kamiyama High School and the animator of the underground music circle 25-ji, Nightcord de., going by the alias 'Amia'. Kind of moody and obsessed with anything cute. Falling in love with one of Kanade's songs found at random online, Mizuki created a music video for it, which in turn caught Kanade's attention. That's how Mizuki became the group's animator. Friends though they may be, Mizuki keeps a big secret from the rest of the group.

Their voice is powerful and notably androgynous.