Kaishin

KaiShin is the slash ship between Kai Satou and Shin Tsukimi from the Your Turn To Die fandom.

Your Turn To Die
Kai and Shin do not have many direct interactions in Your Turn To Die. However, Shin interacts a lot with Kai's laptop.

While searching the first floor of the facility, Shin finds a laptop and works on figuring out its password so he can access the data on it. He manages to do so and finds out that it's Kai's laptop, and that he is connected to the organization somehow. Kai wants to get his laptop back from Shin, so he uses Nao Egokoro to steal it back. Shin reveals the information that he found to the group during the first main game, casting suspicion on Kai. Kai ends up receiving the majority vote. Shin says it's too bad that Kai lost, and Kai understands that with the chance that Shin may have been the Sacrifice, choosing him would be risky.

Shin continues to attempt to decipher the things that are on Kai's laptop. Eventually the participants look the files on it all together. At the beginning of Chapter 2, Shin has a nightmare. In one segment, he goes to the Main Game grounds and picks up Kai's frying pan. He says, "Dead men tell no tales… Right, Kai?". Shin later uses a hacking program made by Kai to eradicate the evil Mishima AI.

Kai's Story
In Shin's first fondness event, as Kai is searching for food, he notes that Shin looks like "skin and bones". Kai realizes he touched on a sensitive topic for Shin, and Shin admits that he'd like to gain some weight. Kai suggests that Shin eats a lot of the food he likes, and after working through different food options, Kai determines the only thing Shin can eat is warm liquids. Kai promises to make Shin something to eat, and Shin accepts, threatening that if the meal ruins his stomach, Kai will "lose".

In Shin's second fondness event, Shin comes to see how Kai is doing. Kai responds that he feels like a common mussel, which confuses Shin. Shin follows Kai at his request without question, and is amazed when he learns that Kai made a powerful food mixer from the materials on the island. Kai created "Sou Soup", but Shin is offput by the purple colour. However, realizing that he will gain weight if he drinks it, he downs it, and finds it surprisingly tasty. Kai seems to utter something implying he's surprised that Sou found the soup tasty, and Shin becomes concerned, wondering what's in the soup.

In Shin's third fondness event, Shin approaches Kai, who notes that Shin's complexion is looking better. Copying what Kai said before, Shin says he feels like a common mussel, but Kai finds that somewhat scary, making Shin confused again. Shin explains that he's in a good mood because he gained 100 grams from eating the soup Kai made. At Kai's silence, Shin elaborates that that amount is a big deal for him. Shin requests that Kai make more of the soup, figuring that if he drank 100 portions, he could gain 10 kilograms. Kai is certain that drinking that much would shorten Shin's lifespan, but in a manic state of mind, Shin demands Kai make more, and chases after him laughing that he can't escape him on this tiny island.

Nankidai tweets
In August 2020, Nankidai posted a series of tweets about a summer festival. In which, Shin gets attacked by Midori and Kai stands up to protect him. Then Shin and Kai attempt to fight together, but Kai seems to get hurt in trying to defend Shin.

Fanon
Kaishin is a rarepair in the Your Turn To Die fandom, since Kai and Shin don't really interact. It rivals the ships Qkai and Keishin. Fans who followed Nankidai's tweets were happy to see a Kaishin moment in the summer festival story. Fans believe Kai would be a good support for Shin, and since Kai is a homemaker, Shin would especially be happy when Kai makes him soup, which is his favourite food. Kai's story further solidified the idea that Kai would be a good option to care for Sou and make sure he's eating properly.

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