Len is a VIRTUAL SINGER best known for performing with his counterpart Kagamine Rin. He 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 Street SEKAI, he is an aspiring DJ and singer alongside his singing partner Rin. He is a regular at MEIKO's cafe and helps out at the shop on occasion.[1][2] Though he's a bit childish, he makes many attempts to act mature by