KaiLuka

KaiLuka is the Het ship between Kaito and Megurine Luka from the Vocaloid and Project SEKAI fandom.

Canon
Kaito and Luka are both characters from the software Vocaloid. They don't have any official dynamic as they are Vocaloid. Their dynamic depends on the song that they sing together. They also have in common that they are from Crypton Future Media, so they coincide in many official stuff. They also appear together in Project Sekai alongside Miku, Rin, Len and Meiko, and help the characters from the 5 different bands to found their feelings.

Songs
Kaito and Luka don't have many duos, but their most popular duet song is El Tango Egoista by nyanyannya. Anyways, the most popular song were both sing is Acute, that is about them and Miku.

In Acute, Miku, Kaito and Luka were best friend since their childhood, but both Luka and Miku started to fall in love with Kaito, so they promised not to confess their feelings in order to not hurt each others. Even so, Kaito and Luka started dating behind Miku's back when they were in the college. When Kaito was remembering a childhood trauma about someone being stabbed, Luka arrived at Kaito's house and there she confessed her feelings. Miku started to doubt if Luka was keeping her promise because she noticed that Kaito and Luka ware very close. Afraid for the situation, Miku confessed her feelings for Kaito and they embraced. Thinking that Kaito truly loved her and Luka just brainwashed him, Miku decided to pretend to be enganged with Kaito in order to "free him". Kaito and Luka noticed that Miku was acting strange and Kaito told Luka that he embraced Miku. Both Kaito and Luka felt guilty about Miku's change. Miku arrived at Kaito's house where they were and she stabbed Kaito, and lately she tried to kill herself to so she and Kaito could be together again. Luka called an ambullance, saving both Miku and Kaito lifes, and at the end Miku apologized to Luka and wished the best for her and Kaito.

Fanon
KaiLuka isn't very popular, but it isn't a rarepair either. People usually prefer KaiMiku, KaiMei and GakuLuka. In AO3 the ship have 18 romantic works and 11 gen works, being the 7th most writted ship for Kaito and the 5th/6th most writted for Luka. Despite not being very popular on AO3, the ship has a big amount of fanarts.

Trivia

 * Their Kizuna Rank titles are: "Two Calm", "There Was a Practice", and "The Current Expression was Good".

Variations

 * Big 8 refers to the ship between the two, Hatsune Miku, Kagamine Rin, Kagamine Len, Meiko, Gumi and Kamui Gakupo
 * Cryptonloid Gang refers to the ship between the two, Hatsune Miku, Kagamine Rin, Kagamine Len and Meiko
 * GakuLuKaito refers to the ship between the two and Kamui Gakupo
 * KaiKuLuka refers to the ship between the two and Hatsune Miku
 * KaiMeiLuka refers to the ship between the two and Meiko