KaiLen

LeKai is the slash ship between Kaito and Len Kagmine from the Vocaloid fandom.

Canon
Kaito and Len are both popular characters from the Vocaloid franchise. Many songs have been made using the two of them in the romantic way. However, besides the fan made content, there isn't much content that is canon besides the interactions they have in the Project Diva opening movies.

Songs
As mentioned previously, many songs have been made using Len and Kaito in a romantic way. One of the most famous songs that have been produced using them is Erase or Zero by Crystal P. The song is about Len and Kaito getting stuck in a time loop, and being faced to confront their feelings for each other. The ending of the song is still up for debate, and fans still theorize this song to this day. Other famous songs include:


 * "The Immoral Memory ~The Lost Memory~" by NatsuP and Haku
 * "FLY AWAY" by ShadowDragonP
 * "Gray Snow" by KID-P, ZankyouP, and CrystalP