Polyshow

Polyshow is the poly ship between Tenma Tsukasa, Emu Ootori, Rui Kamishiro and Nene Kusanagi from the Project SEKAI fandom.

Canon
Emu Ootori, Nene Kusanagi, Rui Kamishiro and Tsukasa Tenma are all from the same band, Wonderlands x Showtime. Everyone except Emu attends Kamiyama High, Emu being the only one to attend Miyamasuzaka Girls' Academy. Rui and Tsukasa are second-years while Emu and Nene are first-years. Tsukasa is a dramatic aspiring star with a big ego and is usually the one his groupmates victimize, Emu is a naive and hyper young girl who tends to drag people into her plans, Rui is an eccentric genius inventor who forces people into strange situations for the sake of shows, and although Nene is shy, she tends to play the straight man of the group, calling them "weirdos". They put on shows together in Pheonix Wonderland.

Tsukasa is the one that Emu usually drags into her plans, and she has headbutted him a few times. Tsukasa is the one that usually stars in Rui's shows, although that usually means strange situations such as being dumped in a pit of robot zombies. Nene thinks Tsukasa is an idiot. Despite this, he considers them friends and enjoys being around them. Rui is able to understand Emu's communication even while the rest of the group don't, and Emu thinks Nene is very talented while Nene wants to help Emu with her issues, though she thinks Emu is weird. Emu likes her group mates a lot. Rui and Nene are childhood friend, they are each part of each other's reasons to get into making shows, and they care for each other. Rui thinks WonderlandsxShowtime is where he truly belongs. Despite finding the group annoying and full of weirdos, Nene really does genuinely care about them.

Their story begins when Tsukasa finds an unknown audio file, titled "Untitled". He then gets transported to a place with a giant stage at the center: Wonderlands SEKAI. This is a world born from his and three other's peoples feelings, where he meets the Vocaloids Hatsune Miku and KAITO. The first time he enters the SEKAI, only the vocaloids are present. Later, he goes back and assumes it was all a strange dream, while his younger sister, Saki, tells him he's about to be late to his audition.

In Phoenix Wonderland, Tsukasa then goes to an audition room to take a job to work at the park. That's when he meets Emu, who is immediately interested by Tsukasa wanting to perform incredible shows. She then says she spotted a super great person. A few days later, Tsukasa sees Nene and Rui for the first time, as he was walking down the streets and muttering to himself. Nene calls him a weirdo, while Rui comments that he's interesting.

At his first workday, Emu scares Tsukasa by dropping off the Wonder Stage. This is their first official meeting. Emu says that this was her way to welcome him, and that she wants to have incredible shows with him. Emu tells him that he didn't pass the audition, but that she really wants to perform with him, thus inviting him to the stage. Even when Tsukasa tries to leave, Emu begs him to stay. After that, they end up in the Wonderlands SEKAI again, meaning that they share the same feeling on wanting to perform shows.

After going out of the SEKAI, they meet Rui and his several robots, that he calls "mechanical actors". He seems to perform shows by telling stories with his robots being his actors. Tsukasa and Emu are really impressed by his way to make shows. Because of that, they want to make him the third member of the park's performers, and so Tsukasa ask him to join them. Rui accepts on one condition, letting someone else he knows join, that person being Nene. Controlling the robot Rui made for her, Nene and the others finally meet. Nene gets accepted in the group, and they're officially groupmates.

They all have the same passion of performing on stage, even though they express it differently. Them appearing in the same SEKAI proves that their feeling is the same. It makes them united in a way.

Fanon
Being from the same unit, Wonderlands x Showtime, the four characters spend a lot of time together, and have several events dedicated to them. Because of how close the four of them are, the fandom started shipping them, as well as some other individual ships between them. It's not rare for an unit in the fandom to be shipped all together. This ship has around 20 works on AO3, but there may be other works that have all ships tagged individually instead. Overall, it is one of the more popular poly ships.

Fandom
FAN FICTION

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WIKI
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Variations

 * Emunene refers to the ship between Emu and Nene
 * Ruiemu refers to the ship between Rui and Emu
 * RuiKasa refers to the ship between Rui and Tsukasa
 * Ruinene refers to the ship between Rui and Nene
 * Tsukaemu refers to the ship between Tsukasa and Emu
 * Tsukanene refers to the ship between Tsukasa and Nene