Project SEKAI Wiki

New rule on Headcanons have been made! The wiki will use continue to use they/them for Mizuki until further confirmation.
For in depth see here!


Project SEKAI Wiki
This page can only be edited by admins Akiyama Mizuki is unknown Member of 25-ji, Nightcord de.
Mizuki's gender identity is currently unknown.[1] Discussion regarding the topic is encouraged, however, please remain respectful to other users with different opinions regarding this topic. Please do not state any theories to be canonical or fact.
For headcanons please only post them in userpages or on the Project Sekai Fanon Wiki.

"I welcome anything as long as it’s cute♪"
―Akiyama Mizuki

Akiyama Mizuki (暁山瑞希, pronounced ah-kee-yah-mah mee-zoo-kee) is a first year student at Kamiyama High School. They're the animator of the underground music circle 25-ji, Nightcord de. — also known as Niigo (N25) — going by the alias "Amia".


Mizuki likes to uploads MVs online. They were captivated by Yoisaki Kanade's music upon listening to it. Kanade saw the MVs Mizuki made and invited them to her circle.

From what has been seen in events and episodes of the main story that reveal Mizuki's past, it is shown that they've been treated like an outcast for as long as we get to see. One day in middle school, they headed to the rooftop for "no reason", only to find Rui, who came to the rooftop almost everyday. Mizuki was hesitant at first, but the two eventually became friends that skipped class and kept eachother alive. In the present, Mizuki still skips school, only going every few weeks so they don't have to retake the grade. But when they do attend school, rumors spread as people stab them in the back they talk behind. As of the Kamiyama Festival, they have become friends with Nene, Tsukasa, Akito and Toya.

Mizuki has a secret no one in the circle knows about. They are also classmates with Shiraishi An in 1-A. In the second episode for the New Years event, it is mentioned that Mizuki has an older sister who lives overseas, though her name has yet to be given.


Mizuki has light pink eyes and light pink hair, slightly curled and worn in a ponytail placed on the side of their head and tied with a ribbon, two even strands of hair let loose, framing their face. They have pale skin and pink mascara. Their voice is powerful and both masculine and feminine.

In their unit outfit, they wear a black sailor uniform. The collar of their uniform is light gray with a black-and-pink ribbon. They wear a gray striped skirt, ruffled with frills and lace on the hem of the skirt. The outer layer of the skirt is held at the left side with a ribbon, exposing the inner layers of the skirt. They wear thigh-high black socks, as well as strappy black heeled shoes.

Their casual outfit consists of a blue-grey pleated skirt with two frills on each side and two straps that have similar frills and lighter lace on the ends of the skirt. They have a chunky off-white button-up blouse with a large, triangular shirt-collar, baggy sleeves and an old-fashioned design going down the middle. Their hair is held up with a black bow, a similar looking ribbon used as a bow tie with what can be presumed to be Mizuki's signature written in gold along one of the strands. In many of their cards, Mizuki can be seen wearing a vintage frilly grey shirt, a ruffled neck tie, pale pink shorts with black rims, black suspenders, white socks and pink lace-up shoes. Their tie has a pink gemstone, and the outfit has accents of gold portrayed in buttons and lining. In this outfit, they have a small pink top hat with black-and-purple stripes and a black brim.

For Mizuki's school uniform, they wear a blue plad skirt, a light-pink blouse as an undershirt, and a yellow-ish cardigan that is mostly buttoned up and has a red and pink stripe going down the middle and along the brims of the cardigan's pockets. Like their unit outfit, their hair is held in the same red ribbon and a red bow tie with diagonal purple stripes.

When they were in middle school, they looked more masculine than they do now [their gender is still not confirmed]. They had much shorter hair and they wore the male uniform for their middle school — a dark red blazer with gold buttons, a pale sweater-vest, plaid brown pants, a turquoise tie and light a blue shirt.


Mizuki is a moody person and Kanade thinks they only act on their own principles. They tend to get frustrated and upset whenever they're ridiculed for various reasons, and they strongly desire to freely express themselves, without holding back or being made fun of due to just being who they are. They're also obsessed with cute things.

Despite their energetic, carefree, and sometimes childish demeanor, Mizuki is shown to be, on more than a few occasions, the most mature member of Nightcord., as Ena herself admits in one of her card stories. They often assume the role of mediator in arguments, breaking things up and settling things down whenever they sense that the air has become too heated. They’re fairly introspective, and are therefore usually the one to suggest breaks when they notice that their fellow members have grown tired or particularly stressed out. Where Kanade tends to intensely hone in her focus, Mizuki keeps their attention at least somewhat rooted in reality, able to sense changes in tension and atmosphere in the group. They are able to come to fairly nuanced conclusions about issues, as well as people, as is evident in the way they spoke of their feelings towards Mafuyu disappearing; describing how they would feel but acknowledging that it is not Mafuyu’s responsibility to respond to, or feel saved by, their feelings.

For better or for worse, they have a very strong learned sense of boundaries: when to involve themselves in the affairs of others, and when to involve others in their own affairs. They make sure to acknowledge that they themselves are bound to have little understanding of others’ struggles before proceeding to offer an opinion. They carry with them a strong recognition of the struggles their fellow members face, and with this comes a belief that the group isn’t an appropriate space to share their own struggles. It seems that they stay secretive, to an extent, from an understanding that everyone has their lies.

Game Interactions

A list of characters that Mizuki interacts with in the game.

Kanade (icon).pngMafuyu (icon).pngEna (icon).pngMiku 25 (icon).pngRin (icon).pngMeiko (icon).pngLuka (icon).pngAn (icon).pngTsukasa (icon).pngAkito (icon).pngToya (icon).pngKohane (icon).pngNene (icon).pngRui (icon).pngAiri (icon).pngShizuku (icon).pngHaruka (icon).pngMinori (icon).pngEmu (icon).png


Yoisaki Kanade: Fellow circle member. Mizuki is grateful towards Kanade for accepting them as they are.

Asahina Mafuyu: Fellow circle member. Mizuki thinks she appears to be nice, but isn't sure.

Shinonome Ena: Fellow circle member. Mizuki enjoys teasing her. They follow her on social media.

Shiraishi An: Classmate from 1-A and a close friend. An introduced Kohane to Mizuki during the Kamiyama High School event. An often tries to get Mizuki out of their house and improve as a person.

Kamishiro Rui: "An old friend". They bonded over being outcasts in middle school, hanging out on the roof together. Mizuki is happy to see that Rui's made friends since then. According to Mizuki's 1* card story, Mizuki is the one who made Rui and Nene's stage outfits after they ran into Rui working on Nenerobo and found it totally uncute.

Kusanagi Nene: "Other old friend". Both became friends by Rui's intervention to help both. According to Mizuki's second 1* story, Mizuki is the one who made Rui and Nene's stage outfits after they ran into Rui working on Nenerobo and found it totally uncute.

Shinonome Akito: Knowing him firstly as Ena's little brother, they call him "little brother-kun", much to his embarrassment.

Azusawa Kohane: Mizuki briefly met Kohane at the Kamiyama High School Cultural Festival before they ran off.

Aoyagi Touya: They met each other during the School Festival. Mizuki, Touya and Akito all go together to watch Tsukasa perform. Mizuki suggested they all sit in the front row to see the play up close, as Touya agrees with a smile.

Tenma Tsukasa: Mizuki knew of Tsukasa in his play ― "Romeo and Juliet: Battle Royal" ― in the School Festival. They thought the play was hilarious. They think Tsukasa is cool, as said in one of their live interactions. He bought them lunch.


Mizuki is either featured in or has an alternate vocal of the SEKAI versions of the following songs:

Song Name Composer Date Released
Charles balloon 09/30/2020
Otome Kaibou DECO*27 11/01/2020
Hitorinbo Envy koyori 12/14/2020
Bocca della Verità Hiiragi Kirai 03/6/2021
Bitter Choco Decoration syudou 07/28/2021
Venom Kairiki Bear 10/04/2021
Villain Teniwoha 12/31/2021
Usseewa syudou 1/30/2022

Song Name Composer Date Released
ID Smile toa 04/19/2021
Lower nulut 10/31/2021

Song Name Composer Date Released
Kuyamu to Kaite Mirai Mafumafu 09/30/2020
Keitai Renwa Mafumafu 11/15/2020
Jackpot Sad Girl syudou 11/20/2020
Infinitely Gray Surii 02/26/2021
Kanade Tomosu Sora Sasanomaly 06/21/2021
Saisei Picon 09/29/2021
Tricologe Niru Kajitsu 01/21/2021
Nomad balloon 03/28/2022

Introduction Video


【25時、ナイトコードで。】暁山 瑞希(CV.佐藤 日向)


  • When referring to themselves, Mizuki uses the typically masculine first-person pronoun “Boku” (ボク).
    • The suffix "-kun" has never been used with them.
  • They have the same height as Haruka, and they are also the tallest member of 25-ji, Nightcord de.
  • Mizuki's name means "dawn/sunrise"[2].
  • In their pre-upgraded A Moment of Jest card, they are seen puppeteering.


Name Interpretation