Shizumizuairiena

Shizumizuairiena is the poly ship between Mizuki Akiyama, Ena Shinonome, Airi Momoi, and Shizuku Hinomori from the Project SEKAI fandom.

Canon
Shizuku and Airi are fellow idols, formerly in the same agency, and now both members of MORE MORE JUMP! Ena and Mizuki are both members of the underground music unit Nightcord at 25:00, as the artist and cinematographer respectively, working together to make MVs. Airi and Ena are childhood friends, having met in middle school. Mizuki is also a fan of both Airi and Shizuku.

The four of them all meet up in the What’s On Your Mind? Exciting Picnic! Event.

What’s On Your Mind? Exciting Picnic!
Ena, being concerned for Mizuki, convinces them to go on a picnic with her, Airi, and Shizuku.

On the picnic, Airi and Shizuku bring up the topic of hope, which makes Ena notice Mizuki looking upset.

Later, Airi and Mizuki get split from Ena and Shizuku, and Airi talks to Mizuki about Ena, and Mizuki realizes they were invited by Ena because she was worried about them. Meanwhile, Ena complains to Shizuku that she may go home without learning anything, and feels like she should just let Mizuki mind her own business. But Shizuku tells her that it’s probably a good thing to find out what’s bothering Mizuki.

When the group reunites, Airi and Ena slide down a cliff and can’t get back up, and it starts raining. Mizuki starts thinking about being unable to tell their secret, but becomes determined to help Airi and Ena after remembering the latter’s concern.

(I’ll finish this part later)

Fanon
Shizumizuairiena isn’t that popular in the fandom compared to their separate ships, but there are still shippers out there.

so far, it has only 1 work on AO3