However, according to the novel 'The Daughter of Evil: Clôture of Yellow', which is written by mothy and was released on August 10, 2010, 'Regret Message' is in the series. It has been debated if 'Regret Message' and 'Re_birthday' are parts of the series or not since there are many tantalizing hints which seem to imply the relations and Akuno-P has just mentioned that it is up to each fan's interpretation and has not officially taken them in the series. The release of the song 'The Daughter of White' on Jan 6, 2010, made it a widely-accepted theory and many fans interpret that the song connects both songs to the series. The following month, a song sung by Rin, 'Regret Message' was released. It was until a few weeks later when the second song of the series, 'The Servant of Evil', was uploaded to Nico Nico Douga and it did gain popularity among the users. The first song of the series, 'The Daughter of Evil', did not gain much attention when it was uploaded to Piapro on April 4, 2008. 5.1 Daughter of Evil ~Gemini of Charm ~.4.5 Chapter 5 -What Happened To Blue And Green.4.3 Chapter 3 -A Feud Between A Swordswoman And The Princess.4.2 Chapter 2 -A Mighty Famine Strikes.2.9 英雄の鎧は常に紅く (Eiyuu no Yoroi wa Tsune ni Akaku).
