The Lapis Re:LiGHTs Web Comic is called "Our Prelude" which revolves around the formation of the 6 main Witch Units!

Written by Asano Hajime and illustrated by Hiroichi, dive into a world where Idols use magic to fight off magical beasts!

(Please keep in mind that while the web comic details how each unit came to be, it is not 100% canon as the official manga writers in Project PARALLEL may have differing plans from Asano Hajime)

LiGHTs: A group of 5 unique individuals, all aiming together to chase the light of the disbanded legendary unit, RAY.
IV KLORE: A group of 4 demi-humans, brought together by a strange string of fate.
Konohana wa Otome: A group of 3 sisters from Yamato, recently transferring into Flora Girls Academy in Waleland, struggling to find their stride.
Sugar Pockets: A group of 3 cutesy members who have been interested in each other for the longest time, but never really had the chance to start.
Sadistic★Candy: A fragment of the legendary unit RAY, coupled together with an extremely powerful witch due to their personal circumstances.
supernova: A group of 3 especially talented students, coming together to form a powerful unit