The series was initially scheduled for 2023, but was later delayed due to "production circumstances". It is set to premiere in April 2024.
Based on a fantasy light novel series written by Furumiya Kuji and illustrated by Chibi.
Unnamed Memory started on the author's personal website in 2008. It later began as a web novel on Shousetsuka ni Narou on September 12, 2012. The first official volume was published on January 17, 2019 by Kadokawa under the Dengeki no Shinbungei label.