Height 163 cm (5'4") Akiyama Mizuki is a first-year student at Kamiyama High School. They're the animator of the underground music circle 25-ji, Nightcord de., going by the alias "Amia". Mizuki is an animator and video maker who uploads their MVs online. They were captivated by Yoisaki Kanade's music upon listening to it. Kanade saw the MV Mizuki made and invited them to the circle. It seems that they stay secretive, to an extent, from an understanding that everyone has things they want to keep hidden.