Kagamine Rin is a VIRTUAL SINGER. She advises MORE MORE JUMP! in the Stage SEKAI, and appears at MEIKO's cafe in the Street SEKAI. 

Kagamine Rin (鏡音リン) is a Virtual Singer known for performing with her counterpart Kagamine Len, but when young people have trouble understanding their true feelings, Rin and her fellow Virtual Singers appear in another world called SEKAI to help them.