The Villainess and the Demon Knight

The Villainess and the Demon Knight (悪役令嬢と鬼畜騎士) is a Japanese light novel series written by Nekoda and illustrated by Asahiko. It initially began serialization on the Moonlight Novels female adult section of Shōsetsuka ni Narō in December 2017. It was later acquired by Ichijinsha who began publishing the series under its Ichijinsha Melissa light novel imprint in November 2020. A manga adaptation illustrated by Seikan began serialization on Ichijinsha's Zero Sum Online manga website in July 2021.

Light novel
Written by Nekoda, The Villainess and the Demon Knight initially began serialization on the Moonlight Novels female adult section of the user-generated novel publishing website Shōsetsuka ni Narō on December 6, 2017. It was later acquired by Ichijinsha who began publishing it with illustrations by Asahiko under its Ichijinsha Melissa light novel imprint on November 2, 2020. Four volumes have been released as of December 27, 2023. The light novels are licensed in English by Seven Seas Entertainment.

Manga
A manga adaptation illustrated by Seikan began serialization on Ichijinsha's Zero Sum Online manga website on July 16, 2021. The manga's chapters have been collected into three tankōbon volumes as of October 2023.

During their panel at Anime Expo 2022, Seven Seas Entertainment announced that they licensed the manga for English publication.

Reception
By December 2023, the series had over 1.5 million copies in circulation.

The manga adaptation, alongside The Transfer Destination Was a World with few Pharmacists, won the Isekai Comic Prize at NTT Solmare's "Minna ga Erabu!! Denshi Comic Taishō 2024" competiton in 2024.