Akikasa

AkiKasa is the slash ship between Akito Shinonome and Tsukasa Tenma from the Project SEKAI fandom.

Canon
Akito and Tsukasa are both students in Kamiyama High School. They both have warm-colored hair with a streak/fade of a different color. Both of them are an inspiration/friend to Touya Aoyagi. They both have sisters, however Tsukasa has a much better relationship with his. They both dislike a certain kind of vegetable, Akito dislikes carrots while Tsukasa dislikes green peppers.

The two were introduced to each other by the aforementioned Touya Aoyagi. At first, Akito wanted to avoid the infamous troublemaker duo "Oddball One-Two Finish" around school. Because he only knew the two by their last names, and from Touya's favorable word. Little did he expect one of the aforementioned oddballs to be his partner's respected upperclassman. He eventually respects him more.

Like in the Kamiya High Festival! event story, after Touya explained his past and his respect towards Tsukasa. Akito muses that he should also express his thanks to the upperclassman. After learning about Tsukasa's fear of bugs, Akito would randomly tease the other for fun and tell him that these bugs are on his clothes. Even when oftentimes they are actually not.They bicker sometimes, but not to as an extreme extent as some other pairings.

The two boys interact in the side story of Tsukasa's. Akito looks for a nice place to nap but finds that Tsukasa is already there. Akito calls Tsukasa a nuisance but decides to wind him up since he has time. Akito asks Tsukasa why he's all hunched up to which Tsukasa claims he is confronting a spider preventing him from enjoying his lunch. Akito asks if Tsukasa is afraid of spiders, and Tsukasa denies it though it's evident that he is afraid of spiders with how bothered he is by such a small spider.

Akito thinks to himself that he was going to tease Tsuaksa, but it's kind of anticlimactic when Tsukasa is shrieking about a spider. Akito catches the spider for Tsukasa and puts it in a bush. Tsukasa shares his lunch with Akito as a token of appreciation for saving him. Akito notices how unnecessarily fancy-looking Tsukasa's lunch looks, and he takes a cheesecake. Akito eats the cheesecake with Tsukasa before leaving.

Akito and Tsukasa also have some area conversations together. At Kamiyama High School, Akito notices Tsukasa practicing his poses. Tsukasa tells Akito he's welcome to stay and watch for as long as he likes, and he is surprised when Akito leaves in a hurry. Also at Kamiyama High School, Akito asks if Tsukasa hates bugs. After Tsukasa confirms the fact, Akito claims there is something on Tsukasa's back that looks like a centipede. Tsukasa freaks out, and Akito leaves after pointing out that it was just a wrinkle in Tsukasa's uniform. Tsukasa asks if Akito actually thought there was a centipede or if he was just messing with him.

Quotes
"Akito, I heard today is your birthday! Now, I will muster up all of my strength for this improv... Hey, wait! Where are you going—!"

- Tsukasa's birthday line for Akito (November 11, 2020)

Fanon
AkiKasa is less popular compared to the other slash ships involving the four human male characters in the series, AkiToya and RuiKasa. Sometimes the shippers of AkiKasa and TouKasa have a shared audience. Some ship the three characters together as a poly relationship named Kouhai Sandwich. There's a decent amount of fan art for AkiKasa as well as fan fiction. AkiKasa currently has 54+ works on AO3.

Fandom
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Variations

 * Fantasista Squad refers to the ship between the two, Rui Kamishiro and Touya Aoyagi