HaiNana

HaiNana is the slash ship between Yu Haibara and Kento Nanami from the Jujutsu Kaisen fandom.

Canon
Yu Haibara and Kento Nanami were Jujutsu High students, being one year younger than Satoru Gojo, Suguru Geto, and Ieiri Shoko. Yu and Kento were the the only students in their class, often resulting in them being sent on missions together.

Haibara and Nanami first appear during Gojo’s Past Arc as the first-year students at Jujutsu High. They were assigned to assist Geto and Gojo on their mission to retrieve Riko Amanai and safely escort her to Master Tengen. Yu and Kento arrive at the Naha Airport in Okinawa, following Geto and Gojo's steps. Nanami seems disconcerted about their presence on Okinawa, as he believes the mission is not appropriate for the first-year students. Yu doesn’t share his skepticism as he looks genuinely happy about helping the second-years, and especially showing Geto how qualified they are. Yu is excited to be part of something bigger as he believes his upperclassmen are putting their lives on the front lines. Nanami is concerned about the possibility of the airport they’re at being hit with a hurricane. He is even less enthusiastic, when Yu gets a call from Geto, and then informs him that they will be staying on Okinawa for one more day.

One year later, Yu is sent on a mission, that ends for him tragically. His body is sent to Jujutsu High, and Nanami, with a wet cloth over his eyes, is seen grieving him in the college morgue. In a conversation with Geto, he shows his discontent with the fact that it was Haibara who was sent there instead of a special grade sorcerer. After Haibara's death and the Jujutsu High graduation, Nanami decides to quit being a sorcerer. He finds a job as a salaryman that keeps him content for a while, unti he remembers that the purpose of every sorcerer's life is to protect other non-sorcerer people.

Ten years later, in Shibuya, Nanami sees mutated people and thinks about the atrocities the curses were willing to commit, and remembers Haibara lying dead in the mortuary. Looking at the disfigured bodies and at the same time thinking about his dead friend, all of them innocent in his eyes, Nanami seems stunned. Later, on the brink of his death, Nanami thinks about the things he could be doing instead of fighting and killing. He imagines living in Malaysia, reading books, and then once again he remembers Haibara, who appears as a vision in front of him. Kento asks him why he, Nanami, returned to being a jujutsu sorcerer, and the apparition of his friend answers him by pointing at Yuji.

Fanon
It is Nanami’s second most popular ship after NanaGo, and the most popular ship for Haibara. The ship is relatively small, as Yu Haibara hasn’t appeared in anime yet, however manga readers have caught onto these characters’ interactions in the story. In fanfiction and art works this ship is often accompanied by SatoSugu and ShokoHime. In many works it acts as a background pairing for the above-mentioned ships. Sometimes, the ship is featured in NanaGo fanfiction as Nanami’s previous relationship. Considering the tragic nature of the ending for both characters, fans of the ship imagine an alternative narrative, where Yu stays alive and they keep fighting curses together, or where they both travel to Malaysia, the country Nanami dreams of going to, and have a peaceful life there. Yu’s enthusiastic and optimistic outlook and Nanami’s stoic and serious demeanor alloy into an amalgam potentially interesting to explore.

Fandom
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Trivia

 * Both died from injuries caused by their bodies being halved in two: Nanami lost his upper body, and Yu lost his lower body (the other part was seen at the Jujutsu High morgue).
 * When Yuki Tsukumo asked Yu about his preferred type for a romantic relationship, he said “girls who eat a lot”. In Nanami’s personal information board it is mentioned that he is a foodie.
 * Both seemed to have been good friends with Suguru Geto, when they studied at Jujutsu High.