Kiamei

Kiamei is the femslash ship between Mei Raiden and Kiana Kaslana from the Honkai Impact 3rd fandom.

Canon
Mei and Kiana are both teenage students who are training to become Valkyries together at St. Freya High School. They're part of the main trio in the game along with another younger girl named Bronya Zaychik. Kiana is very open towards her attraction to Mei and insists that she loves her back. A lot of the time she will blatantly flirt with Mei and carry on with perverted comments or actions to do with her, even in serious situations. Mei usually doesn't mind Kiana's actions as long as she's able to contain her public displays of affection. But after their separation since the Battle of Schicksal, it was clear that Mei became more aware of her feelings for Kiana and even stated multiple times how much she missed all of Kiana's public displays of affection, and was baffled when the Kiana she met in Arc City was not the Kiana she met in St. Freya anymore.

Nagazora Eruption 2014
They first met in the year 2014 when a Honkai outbreak took place in Nagazora and turned many into zombies. As one of the survivors, Kiana made her way to her school's rooftop for safety where she met a senior student named Mei Raiden. She turned out to be a Herrscher, but her human conscience appealed to Kiana so they fought as she tried to save her. Once Mei gained control of herself again, she tried to jump off but Kiana grabbed her hand and pulled her back up with a smile, resulting in the Herrscher deciding to hide away in Mei's heart because she could tell her host cared about this girl. From there on the two became close friends as they tried to escape their school together. Later on, Mei thanks Kiana greatly for saving her life, which is also when Kiana calls her cute for the first time.

The two later met Bronya and the three attempted to escape the ruined city. Later, Kiana was gravely injured by a Honkai beast which reawakened the 3rd Herrscher in Mei. Under the influence of the 3rd Herrscher and cradling Kiana’s unconscious body, Mei destroyed the Honkai beast that injured Kiana. This caught the attention of Himeko Murata, a Schicksal Valkyrie. Himeko and Mei fought and during the fight; Kiana suddenly woke up and destroyed Mei's Herrscher wings, bringing Mei back to her senses. The two were then taken to St. Freya High where they train to become Valkyries with Himeko as their teacher and Theresa Apocalypse as their principal.

AE Invasion
After the events of the Xuanyuan Chronicles, Himeko was hospitalized and Kiana felt extremely guilty for it. Theresa Apocalypse decided to take Kiana with her for training since Kiana didn't want to mess anything up again. While the two were training, Anti-Entropy sent a Welt Joyce clone to capture Mei and what ensued left Class Monitor Fu Hua gravely injured and Bronya & Mei unconscious. While unconscious, the 3rd Herrscher within Mei awakened and attempted to kill the Welt Joyce clone, yet was quickly overpowered due to a heart-bomb placed within her. Upon hearing that Mei was in danger, Kiana attempted to leave and help her. The two of them work together to defeat the Welt Joyce clone which leads to Mei powering up Kiana's battlesuit and their dorms being destroyed.

St. Freya
In 2016, Bronya, Kiana, and Mei were tasked to recover a battleship called the Selene. During the events of Chapter 1, Kiana saved Mei from a Honkai zombie about to attack her and the 3rd Herrscher within Mei saved Kiana from a horde of Honkai beasts. The trio soon returned to St. Freya to take the yearly Valkyrie Examination exam where during one of Kiana's nightmares Sirin calls Mei Kiana's girlfriend (though this was later changed due to censorship, there are still times that this dialogue comes back and players see it).

Sometime later, the trio is sent to New Zealand to recover the Gem of Desire, which has been placed inside an ex-Valkyrie named Wendy. Wendy soon lost control and became the 4th Herrscher. The three are forced to fight her and during this situation, Anti-Entropy suddenly appeared and ambushed them with a brain chip placed within Bronya. Both Mei & Wendy were captured by Anti-Entropy and a rescue mission is setup where Kiana attempted to save Mei. During the rescue attempt, Bronya sacrificed herself and fell into a coma to save Mei.

Battle of Schicksal
Things turn for the worst as Otto Apocalypse abducted Kiana and reawakened the 2nd Herrscher (or Herrscher of the Void) within her. To save Kiana, the Far East Branch of Schicksal teamed up with Anti-Entropy to defeat Otto. When Mei suddenly reunites with Kiana during the Battle of Schicksal, the 2nd Herrscher defeated Mei and takes the Herrscher core within Mei for herself. The removal of the core caused Mei to fall into a coma for some time.

The Battle ultimately ends with Fu Hua getting shot in the head by Otto, Himeko dying in an attempt to bring Kiana back, Kiana going MIA, and the rest of the group including Mei becoming fugitives.

Arc City
After a timeskip of four months, the current group consisting of Theresa, Bronya, and Mei head to Arc City after hearing about some sightings of Kiana within Arc. The three find the Ningyo, a cyborg who might have some information on Kiana’s whereabouts. However, Rita Rosseweisse, a powerful Schicksal Valkyrie ambushed them and resetted the Ningyo before anything could be found.

The team later split with Theresa and Bronya heading to the Deep while Dr. Telsa and Mei went to repair the Ningyo. The Ningyo suddenly rebooted and Rita reveals Kiana’s location. However, Kiana was kidnapped by the World Serpent, a mysterious organization with suspicious motives. Rita contacts Mei for support and goes back to Arc City. The two reunite and Mei asks Kiana to return to the Hyperion. Kiana, however, could not go back. It turns out that the World Serpent has been planning to cause a Honkai eruption in Arc City to move towards their goal of enacting Project Stigma.

To save Arc City, Kiana sent the Honkai reactor flying into the sky and absorbed the Honkai energy with in the bomb. Kiana passed out and fell from the sky. Mei rushed to save Kiana only to be stopped by Durandal, the most powerful Valkyrie in Schicksal. Durandal brought Kiana back to Schicksal, and Mei was left helpless.

Thunders Over Nagazora
While imprisoned at Schicksal, a World Serpent ambush occur and Kiana used this opportunity to escape and make it to Nagazora. After detecting Kiana's energy fluctuation, Dr. Tesla also took Mei to Nagazora to reunite with Kiana once again. Mei also reunites with Raven and the two team up to find Kiana, yet it turned out that Raven wanted to kill Kiana all along. The two fight, though without her Herrscher powers, Mei couldn’t do anything. Regardless, Mei tried to stop Raven and started concentrating Honkai energy in her body. She defeated Raven and went to find Kiana. This time, however, it would not be the same.

Due to all the Honkai energy within Kiana’s body, she only had at least 2 months to live. This news devastated Mei and she found herself unable to do anything about it. The leader of World Serpent, Kevin Kaslana notices this and makes a deal with Mei: World Serpent could save Kiana if Mei becomes a Herrscher again and join them. Desperate to do anything to save Kiana, Mei gladly took the offer.

Kiana fought Mei in a desperate attempt to have her stay, yet in her weakened and dying state, she couldn’t do anything. Mei won the fight and the two parted ways once again.

Set Tomorrow Ablaze
This story arc is the time where both Kiana and Mei are in their separate organizations (Anti-Entropy and World Serpent, respectively) trying to end the disaster in their own ways. Both get sucked into the Theater of Domination where the Herrscher of Domination and its 1000 puppets reside, and the both of them try to get out/end the disaster in their own ways. As the puppets separate Mei from the theater (by creating an illusionary space) to prevent her from finding out their true goal (which is to awaken Herrscher of the Void and make Kiana and Herrscher of the Void fight for absolute control of K-423's body), Mei fights with countless puppets just to get out of the illusion and back to the theater to be able to assist Kiana as Mei is aware of her presence yet at the time Kiana wasn't. As it dawned on Mei that her fully awakened herrscher power (called Conquest) is stronger than that of Domination (meaning they can't steal hers like they did with Fu Hua and Bronya's power), she used this opportunity to be able to weaken the puppets by a lot when she slashed them down with multiple thunders accompanying it. The effects of Mei's attack caused thunders to strike down all over the Legion Theater and it startled Kiana as she was staying in the fragmented space created by the Gem of Haste along with Himeko, and at this time Himeko tells Kiana to leave and defeat the Herrscher of Dominance, and when Kiana got out, Bronya and Fu Hua inform her of Mei's assistance from somewhere in the Theater of Domination.

Kiana acknowledges this as she moves forward to fight against the Herrscher of Domination with her friends, and is grateful as she knows that Mei is there to fight by her side albeit being separated by the fragmented illusions of the theater.

As of now, it is unclear whether or not Mei saw the transformation of Kiana into the Herrscher of Flamescion in the Legion Theater.

Beyond Will
Kiana tries opening a crack in the Imaginary Space to fight Otto, though her powers are limited. She hears Mei's voice telling her to hold on just a little while longer and that she'll be able to help her. In the Imaginary Space, Kiana relives some past memories she had with Mei, including her last fight with Mei. Kiana says that there's a million things she'd do in that moment just to keep Mei with her, though if she did, they wouldn't be where they are now. Kiana is then able to communicate with Mei through the deepest part of their Herrscher cores. Mei jokes that Kiana isn't wearing her jacket like she said she would, catching Kiana off guard. She states that Kiana has changed a lot, though Kiana replies that they haven't changed a bit. Mei elaborates that they're in a space created by the Will of the Honkai and they have limited time here. Kiana fills her in that she and Durandal are on their way to fight Otto, so Mei says she'll help Kiana, saying that no matter how many times her blade breaks, Mei would reforge it for her. As they part ways, Kiana is hesitant to say something, and Mei reassures her that she understands. Kiana states that they have the strength of one hundred warriors with Mei around, a callback to her line in Chapter 1. Mei giggles lovingly at this and as she lends Kiana her power, she says "Alright...Then take it, the strength of a hundred people." After receiving Mei's power, Kiana thanks Mei and goes off on her way to defeat Otto.

Quotes
"I always believe in Mei. We're the best of partners, after all."

- Kiana's Herrscher of Flamescion battlesuit bridge lines

"The night is so quiet... I miss her."

- one of Mei's bridge voicelines about Kiana in the Herrscher of Thunder battlesuit

"I like how you, at the end of every mission, would kick down the dorm door, and shout "Mei, I'm home!", and then leap beside me and yell about how hungry you are... I would always rub your hair and tell you... "Welcome back!" I like all these about you."

- Mei, Chapter 8 about Kiana

"You said you were alone. I used to be alone myself. Two ex-loners make the perfect team."

- Kiana, Chapter 16 flashback to when they first met

"Because we understand each other, I know what her decisions would be, and it's the same way around, and none of this is going to be changed by how far we're apart or how different our positions are."

- Mei to the 10th Herrscher about her and Kiana

"I don't need to go back to the past. Neither does she."

- Mei, Chapter 25

"Fight for all that is beautiful in the world — this is my mission, and my promise to Himeko. And in my heart, you're the most special part of all the beautiful things in the world. That's why I hope... you can care about yourself more..."

- Kiana to Mei, Chapter 32.

Fanon
Kiamei is the most popular ship in the fandom and the most well known outside the fandom. Some players even state that if miHoYo does not add Kiamei into the 4th game, they should at the very least let them reunite, or give a bittersweet ending and state that if the two would get a bad ending they would quit the game. Some people might dislike the ship because they see it as "overrated" or think that Kiana is annoying and clingy. Some may even go as far as describing some of Kiana's actions towards Mei as harassment. Though as the story continues and the characters keep growing, there's still many chances for more people to come and like it, especially as their characters develop more (i.g. Kiana maturing, and Mei being more aware of who she's really fighting for).

It is the most written about ship on AO3 with Sentihua (HoS x Fu Hua) and Bronseele (Bronya x Seele) coming in second and third. Kiamei is considered the most popular ship in the fandom because of it's canon status and the relationship of the two characters being very centric to the story. Along with Kiamei there are also ships that include a third person with them in a poly ship, the most popular ones are Fukimei and Elykiamei.

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Trivia

 * They're both Herrschers; Mei is the Herrscher of Thunder and Kiana is the Herrscher of the Void and Flamescion.
 * Kiana loves food and Mei is an excellent cook. Kiana, on the other hand, is a bad cook.
 * In the game, there is a stigmata named "Eternal Love", which has art of Kiana in a tuxedo holding Mei in a bride outfit.
 * Kiana is often compared to a tuna as a joke by fans and developers of the game. Because of the joke, MiHoYo added in-game weapon named "One Salty Tuna" which, as a sword weapon, can be equipped on Mei.
 * In the Mystery of Stigmata manga, which was later decanonized, there was a scene where Mei was worrying about Kiana and had a dream where they got happily married, only to result in Kiana dying before her eyes.
 * The trial character of White Comet (W.C.) for Chapter 17, in the stage where Kiana and Mei fought before Lament of the Fallen, W.C's stigmas are shown to have Mei stigmatas, namely; Mei: Princess (T), Mei: Bride (M), Mei: Birthday (B).
 * In the Chapter 17 stage that takes place during Kiana and Mei's fight, the trial battlesuit, White Comet Kiana, is equipped with Mei stigmatas, namely; Mei: Princess (T), Mei: Bride (M), Mei: Birthday (B).
 * In the end of the main story for Guns Girl Z/Houkai Gakuen 2 (HI3rd's predecessor), God Kiana destroys the world and tearfully kills Mei. Before the world resets, God Kiana asks if God exists and that if God does exist, let her and Mei meet again in the next world.
 * In the Xuanyuan Chronicles, Kiana mentions having a cat named Sora. Mei believed Sora to be another girl and Bronya comments on how she "detects jealousy" which lead to Kiana having to clarify that Sora was her cat.
 * In A Post-Honkai Odyssey, an open-world game mode set eight years after the main story; says that 99% of Honkai energy is sealed on the moon, Mei's introduction states that "she is anticipating a reunion with someone special", clearly referring to Kiana. As Kiana was said to be "MIA" and it was hinted that she sealed herself on the moon along with 99% of Honkai Energy and Mei was noticed to be always looking at the moon as the APHO main character's dialogues regarding Mei said.
 * The canonicity of this game mode is however up for debate since miHoYo flips back and forth between "canon" and " non-canon" often, stating the lines "APHO is in the same worldline". So it is muddled as of now whether it is canon to the main story or not.
 * In the 2017 White Day (March 14) there were official tokens added in-game wherein two rings were seen. Namely, "cat's claw ring" which is a ring given by Mei to Kiana, and "bow ring" which is given by Kiana to Mei. The selling price for the cat's claw ring is 520, while the bow ring 1314 in-game currency. In Chinese, 520 is slang for "I love you", and 1314 is slang for "forever."
 * While it's not exactly confirmed in Honkai Impact 3rd specifically, it's heavily implied and commonly accepted in the community that Kiana is a lesbian.
 * In Houkai Gakuen 2 4koma, however, she mentions multiple times that she's not interested in men or that she's a lesbian.
 * In AE Invasion, a simulation of Siegfried calls her "lesbo", which she is embarrassed at but doesn't deny.
 * Kiamei's Chinese ship name is '琪芽' (Qì yà). The etymology behind it is that the characters were picked from the first character of their given name.
 * The 3rd Herrscher persona was also in love with Kiana due to Kiana making her feel other emotions for the first time and saving her. She stayed dormant in Mei's mind out of fear of hurting Kiana. The 3rd Herrscher is also fiercely protective and possessive of her.

Variations

 * Fukimei refers to the polyship between Raiden Mei, Kiana Kaslana, and Fu Hua
 * Elykiamei refers to the polyship between mRaiden Mei, Kiana Kaslana, and Elysia