Though obscure, planted seeds in future works. The visual novel Saya no Uta (Song of Saya) shares similar themes of monstrous transformation and body horror. In the anime world, Mahou Shoujo Site directly references Imaria in a single frame (a poster in Asagiri's room).
Zero reveals a terrifying flaw: Imaria does not simply store forgotten memories; it consumes the emotional capacity to love, grieve, or hope from anyone connected to it. As the city gears up for the “Great Purge”—a festival celebrating total emotional numbness—Arisu must decide: OVA Imaria