is a Japanese light novel series written by Tomoaki Amagi and illustrated by Tsukasa Kiryu. It began serialization on Kadokawa Corporation's Kakuyomu website in March 2021. It was later acquired by Overlap who began publishing it under their Overlap Bunko imprint in July 2022. A manga adaptation illustrated by Nitora Noi was serialized on Overlap's Comic Gardo website between March 2023 and September 2025.
Synopsis The hero Alexander went on a raid with his party to finally defeat the Demon King and end the war. However, the raid ended in failure as the Demon King utterly destroys his party. Two years later, Alexander wakes up and finds out that he has been reincarnated as the Demon King's son Zilbagias. With his memories intact, he vows revenge on the Demon King by destroying the kingdom from the inside.
Media Light novel Written by Tomoaki Amagi, Zilbagias the Demon Prince: How the Seventh Prince Brought Down the Kingdom began serialization on Kadokawa Corporation's Kakuyomu website on March 31, 2021. It was later acquired by Overlap who began publishing the series with illustrations by Tsukasa Kiryu under its Overlap Bunko light novel imprint on July 25, 2022. Six volumes have been released as of May 25, 2025. The series is licensed in English by J-Novel Club.
Manga A manga adaptation illustrated by Nitora Noi was serialized on Overlap's Comic Gardo website from March 7, 2023 to September 19, 2025. The manga's chapters were collected in four volumes released from June 25, 2023 to August 25, 2025.
Reception The series was ranked fourth in the bunkobon category in the 2022 Next Light Novel Awards.
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