Please correct this artist to 重音テト Teto Kasane is a "hypothetical" future release of the Vocaloid character series, following the Kagamine twins. She is conceptualized from 2ch, and is supposedly released by a group called Crvipton. (A lampoon of Crypton, the company behind the Vocaloid character series.) In reality, she is an April Fools joke created by VIPPERs of 2ch, meant to trick Nico-Nico Douga users into thinking she is a Vocaloid from Crypton.