The Most Heretical Last Boss Queen

is a Japanese light novel series written by Tenichi. The series originated on the Shōsetsuka ni Narō website in April 2018, before being published in print with illustrations by Suzunosuke by Ichijinsha beginning in June 2019. A manga adaptation, illustrated by Bunko Matsuura, was serialized on the Zero-Sum Online website between March 2020 and March 2022. An anime television series adaptation by OLM aired from July to September 2023.