mothy wrote that he spelled the English's song title as Twiright instead of Twilight because of the duality of the characters' VOCALOIDs, Kagamine Rin and Len, as well as a pormanteau of "twist" and "right".
The song was originally composed for a fanmade The Daughter of Evil musical adaption.
While the lyrics in the album booklets use kanji, the PV's subtitles exclusively use hiragana and katakana.
The secret the demon tells Allen is the one used by Riliane in regret message.
A silhouetted figure resembling the master of the graveyard from Heartbeat Clocktower is visible in the PV.
The niconico upload is described as "'The Daughter of Evil' and 'the Servant of Evil'. A small memory of the so-called twins when they were young."
mothy's official playlist lists the song as occuring in EC 491 and describes it as "An incident during the youth of the Lucifenian princess and prince."