Angelique Retour Secret Side (アンジェリーク ルトゥール Secret Side) is a prologue webcomic to Angelique Retour which had been distributed at the same time as the eponymous printed comic. Secret Side features rebooted origin stories for the Sacred Guardians of the Sacred Bird Cosmos. Ruby Party oversaw the narrative while Miko Mitsuki created and illustrated the comic. It is serialized in Sho-Comi Zoukan and being published by Sho-Comi Books under its Flower Comics label. It concluded in six stories and is compiled into two volumes. Readers could read episodes for free online for limited intervals.