Mizuka is Kōhei's classmate and childhood friend. She is constantly sighing, being made to go along with Kōhei's meaningless jokes. She takes unusually good care of him such as going to his house every morning to wake him up. For clubs, she helps around the orchestra club and plays the cello. She likes milk so much that she can even drink it while eating rice. Mizuka is a cat-lover and has several of them at her house. She tends to add &quot;~da yo&quot; and &quot;~mon&quot; at the end of her sentences and at one point of the story she gets called a &quot;Dayomonian&quot;, but only once. She worries about Kōhei, wondering if he could suddenly get a girlfriend. Later, there is a motif where her childhood self becomes a guide for the main character in the Eternal World. Voiced by: Mayumi Iizuka (PS), Yūko Minaguchi (drama CD), Ayako Kawasumi (all-ages OVA), Ayaka Kimura (PC full-voice).    From Wikipedia.

Orihara Kouhei returns to his town after a long disappearance to fullfil the promises he made to several girls in his childhood. He suffered from memory loss, and carries a tragic past. An strange ambience surrounds the OVA...It's almost like a dream, like memories from the past trying to come together in one piece but without being able to...
 
(Source: Anime News Network)

__Non-anime roles:__
- Shenhe - Genshin Impact (VG)
- Sugar - Goddess of Victory: Nikke (VG)
- Dikke - Reverse: 1999 (VG)

In 1998 winter, another world happens to come to existence in me, though I used to be a normal student. It is covering my ordinary life as the snow covers the ground. Until then, I haven't noticed, what has stayed unchanged in my daily life, the familiar scenes that have always been there, the warmth of the person whom I haven't noticed that I love her. 
They have existed to bind me in this world in order not to let me leave. 
It is the moment when I begin look for the bind and the significant person, for the first time. The time goes, and the sun gradually begins to shine the season. I wonder where I will be, and who will grip my hand.

Mizuka Nagamori