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A VIRTUAL SINGER with long pink hair. She has a calm disposition, and an elegant, soft voice, which can brim with passion when singing emotional songs. She's bilingual, singing both in Japanese and English.
—Profile

Luka and the other VIRTUAL SINGERS live in another world called SEKAI, but appear in the real world to consult people who have trouble understanding their true feelings through music.

In the School SEKAI, she is Miku's senpai, and together they help the girls to reconcile.