Polyniigo

"Ena, Kanade, Mafuyu... I like them all a lot."

- Mizuki in their 3* event card from the "Guiding a Hand That Could Get Lost"

Polyniigo is the poly ship between Kanade Yoisaki, Mafuyu Asahina, Ena Shinonome, Mizuki Akiyama from the Project SEKAI fandom.

Canon
Kanade, Mafuyu, Ena and Mizuki are all part of the music circle 25-ji, Nightcord de/Nightcord at 25:00, with Kanade/K being the leader/composer, Mafuyu/Yuki the lyricist, Ena/Enanan the illustrator and Mizuki/Amia the music video creator. The group circle name is formed by them having Nightcord (Discord) call/chat sessions everyday at 25:00 (1 AM) to discuss about their music and others. They all attend different school classes, Kanade attending Online High School, Mafuyu attending Miyamasuzaka Girls' Academy, Ena and Mizuki both go to Kamiyama High, however Ena takes night classes while Mizuki does normal classes. Kanade, Mafuyu and Ena are second-year high school students, while Mizuki is a first-year.

The four used to individually make their own content before they formed 25-ji, Nightcord de., until Kanade had listened to Mafuyu's song. She quickly rushed to make an account to message Mafuyu if she had wanted to make music together, later on Ena joined, then Mizuki. At that time, none of the 25-ji members had actually known each other, not even knowing their real names and only referred to each other by their Nightcord handles (K, Yuki, Enanan and Amia), as they used the chat tool Nightcord (Discord) to communicate.

The group has an area conversation at the shopping mall with all four of them. Ena and Mizuki are checking out outfits while Mafuyu and Kanade note that the former duo doesn't want to leave the store. Kanade thinks to herself that they should just go home since they already had a party to celebrate the release of their new song. Ena asks if Kanade likes a hat, adding that she thinks the hat would look fabulous on Kanade. Kanade says that she isn't the type of person to go out while Mizuki talks to her. Mafuyu tells Kanade to have fun and not worry about her; Kanade asks to be pitied.

Main Story
The main Niigo story starts off normal, them creating music and doing music things. However, one day when Yuki doesn't attend their Nightcord session although Yuki and Amia were in a call just that evening, the three find it confusing but shake it off as sometimes people fall asleep easily. This does not conclude the mystery as from that day Yuki has not been online for the next week, the members start to worry for Yuki's safety and health. Since they've only communicated by voice and have never actually seen each other it was difficult for them to figure out what had happened to Yuki, but Amia found something interesting in the shared folders. The file had seemed to be a music file created by Yuki the day she had went missing, the title of the file was named "Untitled". The three decided to take a listen to the file, but what only played was a shining glowing light from their screens, which brought them to Yuki's SEKAI. That day was the first time K, Enanan and Amia had seen each other's faces, excluding Amia and Enanan as they were already following Enanan's selfie social media before the strange events had occurred.

The three were extremely confused on where this place was and how they even got there, the first thing they decide to do is try to find a way back home, so they start to walk around until they could find something. After finding nothing in such a empty, strange place, they decide to instead introduce themselves, which ends up them leading back to the topic of Yuki. A hologram finds them and approaches them, which Kanade seemed to recognize, the hologram calls herself Miku, and tell the three that they need to find and save the girl.

A voice calls out to Miku wondering why people were there and Mizuki notices a hint of Yuki in the voice. Kanade calls out to Yuki and Yuki had seemed to recognized her as well as Ena and Mizuki. Mizuki had thought they all winded up in the same situation wanting to go home and got lost but Yuki just replied asking for them all to leave the SEKAI and to leave her alone. This left the three confused, Mizuki then asks Mafuyu if it means she's not going to make music as N25 and Mafuyu replies with "Yes. Don't make me say it again.". Kanade confronts Yuki with the whole OWN thing asking if she was going to continue making songs as OWN, this just left Ena and Mizuki even more confused. Yuki finally accepts that Kanade was right and that OWN was her, which pisses off Ena a lot. Yuki explains that it was pointless for her to continue to be in N25, as she says it wasn't enough. Yuki continues on with saying she thought K's song had saved her, if she stayed by K's side she would be able to find it, however, it seemed to not be enough for her. She then says that she has no other choice but to look for it by herself and then finally asks Miku to kick the others out. Miku asks if Yuki thinks she'll actually find it on her own and Yuki just replies with "If you… If you say that there is a chance that… I can still find myself, then even if I have to throw everything away, I will keep searching. …For me, that’s all I have left. If I still can’t find it then, I’ll have no choice… but to disappear.". Ena objects saying that Yuki was saying nonsense and was acting strange, to which Yuki hits back saying, "Strange? If I’m strange, then the same goes for all of you. Because the truth is, K, and Enanan, and Amia—— you all want to disappear more than anyone else on this Earth.", she asks Miku to kick them out again and this time Miku obeys with no hesitation.

SEKAI Happy New Year!
On the 2nd chapter of SEKAI Happy New Year!, as the members of 25-ji were about to log off of Nightcord and call it day, Mizuki stops them to ask if they could all meet up. Before Mizuki could even finish their sentence, Ena immediately declines, saying that it was too cold and she did not want to leave her house, Kanade then agrees and also declines Mizuki's invitation. Mafuyu declines as well, due to cram school which would also lead to a possibility that she'd be late for their 25:00 Nightcord session. Kanade asks about Mizuki's New Year Eve show that they had mentioned before but they unfortunately had missed out on getting tickets so Ena suggests that they should just stay home to which Mizuki doesn't want to as their parents had left them to visit their sister overseas, which ends up making Mizuki home alone. They then try to shoot their shot again and slips a mention about the N25 meetup they wanted but then Ena as well as the other two again, immediately declines. The next day, on New Year's Eve Mizuki goes to a cafe alone, envy of the people around them having a good time with others. They overhear a conversation about one going to a friends house for a New Year's Eve party which Mizuki takes an interest in thinking how they could have one with N25, but instantly scraps the idea as they know Ena and Kanade wouldn't want to go at all, plus that Mafuyu's parents probably wouldn't allow Mafuyu to go anyway. However, they also managed to think of a solution to that.

Later that day, Mizuki announces that they had an idea in mind to the rest of N25, Ena complains and asks Mizuki to stop shouting into their mic, then Mafuyu logs on saying that cram school classes ended early, which made the perfect opportunity for Mizuki to propose that they all should have a New Year's Eve countdown party. Although they all had the same reactions as before, Mizuki says they all wouldn't have to go out, and that they could just do it in the SEKAI with Miku and the others. Ena, still conflicted saying it's a pretty empty place and wouldn't fit the criteria for being a party place, but Mizuki promises to bring snacks and stuff and would organize the whole thing which then made Ena finally agree. Kanade and Mafuyu also agree as they haven't seen Miku in a long time. Mizuki then expresses their happiness and tells the others and they'd tell them on Nightcord for when to come to SEKAI. Once everything was ready, they all went to the SEKAI and greeted Miku asking if she'd want to join their New Year's Eve countdown party. Miku asks what they all brought and Mizuki says they had brought many bags of party snacks, Ena had brought some juice from her family New Year gift pile, Kanade had brought some limited edition chips and Mafuyu brought some fancy disposable plates, cups and napkins. Mizuki thanks them all for bringing these and continues to set things up, Miku then comments, "You all seem happy... I'm glad." Everything was all set up and Kanade says it feels like an actual party that were about to start, Mizuki agrees and lists out everything that was brought that made it an awesome party, Ena replies with "that might be a little too much.. But it is nice every once a while." It was almost time to start the countdown so Mizuki made sure everyone was there and would countdown all together. They all say their happy new years and continue to party.

Secret Distance
In the Secret Distance event, Mizuki feels like although Niigo have been working together for a long time, they don't really know much about each other which they had thought if they did Ena would've talked to them about what happened in Unsatisfied Pale Color. So, they decide that Niigo should go on another little excursion like last time when they went to the doll exhibit. Mizuki suddenly remembers the time they went to the Kamiyama Festival and saw a class doing a haunted house which made them wanting to see Niigo's reactions to haunted places, since they also found a good list of haunted houses and it seemed fun, they decided on that. The next day, Kanade asks everyone to meet in the SEKAI which worries Mizuki thinking something bad happened, Kanade then apologizes which had shocked Mizuki, but then instantly forgives her for whatever shes done. Kanade then explains that she hadn't been able to finish the demo of their song. The others try to see who can help but Mizuki and Ena don't know much about composing and Mafuyu says whatever she does won't help at all. Miku suggests for them to try something new, which Rin agrees to. Rin spots MEIKO and MEIKO joins them, however she says she doesn't want to be involved with anything and will just observe. Going back to the topic of Kanade's problem, Mizuki suggests they should go on a one-day mystery tour, and explains if they go to places they've never been before, Kanade might be able to come up with some ideas, which that made them all agree.

On the next day, they all meet up in the morning and aboard a train. Ena says she feels like shes been on the train for an eternity and asks Mizuki again to tell them where they're going. Mizuki says, "Patience is a virtue, Ena. You should be trying to imagine what sort of fun-filled adventures I have in store for us.". Since they were almost there, Mizuki ends up telling them that they were going to a haunted area. Kanade and Ena seemed a little bit scared, while Mafuyu, as always, was unfazed. Mizuki tells them they thought a test of courage might do them good, but Ena claims that Mizuki just wanted to go for their own wants, which they don't deny. Mafuyu just says it doesn't matter where they go as long as it helps Kanade. Kanade again apologizes for putting them through trouble, which Ena and Mizuki tell Kanade that it's alright and to not feel bad, then Ena adds that it was Mizuki's fault anyway. Mizuki tells her it'll be okay since there were good photo ops at the haunted area and Ena replies with "Thats not what I have a problem with!!".

Fanon
Polyniigo is most popular as a between Kanamafu and Mizuena, though the other ships within Polyniigo are also recognized. It is currently the 3rd most popular poly ship in AO3, only barely lagging behind Polyneed.

In 2022, a second 25-ji Ship Week was held from November 19th to November 25th. The first day was committed to Mizukana, the second day was to Kanaena, the third day to Mafuena, fourth day to Mizumafu, fifth day to Kanamafu, sixth day to Mizuena, and the last day was a free choice.

Fandom
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Trivia

 * As a whole group, Polyniigo have covered 5 songs together (,, , and ), the least out of all the groups.
 * Some of their Cheerful Carnival Team titles are "Recollection", "Destination and Footprints", "Insatiable Pale Color", "Imprisoned Marionette" and "First Summer Festival With Us Four".