Warning of Impostors (ニセモノ注意報), also translated as Impostor Advisory, is the second uploaded song of Shuuen no Shiori Project, produced by 150P. This song is based of B-ko's discovery of her doppelgänger.
This song was first released on NicoNico, uploaded on 10 June 2012, sung by IA. It is later released as such in the album Re:Houkago -Shuuen Game-. When it was rereleased in the Shuuen -Re:write- album, it was sung by Kagamine Rin. It was also released in the Shuuen -Re:act- album, sung by B-ko's voice actress, Touyama Nao.
