User blog comment:Serza5/Vocals I hope to see in the near future/@comment-30602727-20140426005402/@comment-5035488-20140501023304

The twins are called Shouta Tsukiyomi and Ai Tsukiyomi.

@Serza They were actually gonna make an English Male Vocaloid. But that was announced a long time ago, so who knows what could have happpened to it?