New phase of the Kagerou Project, being another multi-media project spanning manga, music, and anime. It is a spin-off of the main series that takes place in the same world of the Kagerou Project three years later but through another perspective.

The anime in particular was to debut in a special screening on January 26th 2020, which was a reward only for those who completed the MekakuCity Quest, a limited-run real escape game campaign. However due to various circumstances, the premiere was delayed until further notice.