Nightcord at 25:00's video editor. Mizuki wanted to do something about the worsening relationship between Mafuyu and her mother, but felt unable to offer anything knowing that they are running away from their problems. However, Mizuki realized that there are things that can be gained by running away, and told Mafuyu that doing so is always an option.Mizuki has light pink eyes with a pink eyelash. Their hair is also light pink, and is slightly curled and worn in a side ponytail tied with a ribbon. Two even strands of hair are let loose, framing their face. Their initial casual outfit consists of a knee-length blue-gray pleated skirt with two frills on each side and suspender straps, leading to a loose, off-white, button-up, peasant top. Their hair is held up with a black bow, and uses a similar-looking ribbon as a bow tie, with the brand "CubeRouge" written along one of the strands in gold.

In their second year, their casual outfit is a gray blouse with white trims at their collar, sleeves and buttons. They wear a pair of long pink pants that reveal a darker pink lace pattern through the middle of each leg, as well as pink suspenders. Below the waistband is a slightly ruffled design that holds Mizuki's belt, which is pale dull pink and has a silver circular buckle. In their hair, Mizuki wears a pastel and maroon bow with a heart charm.