is a Japanese fantasy light novel series written by Meguru Seto and illustrated by Note Takehana. It was serialized online from January 2017 to February 2021 on the user-generated novel publishing website Shà Âsetsuka ni Narà Â. It was later acquired by Kodansha, who have published six volumes since August 2017 under their Kodansha Ranobe Books imprint. A manga adaptation with art by Tomoyuki Hino was serialized via Kodansha's Niconico-based Suiyà Âbi no Sirius manga service from May 2018 to June 2023. It has been collected in twelve volumes. Both the light novel and manga are licensed in North America by Seven Seas Entertainment. An anime television series adaptation by Okuruto Noboru aired from January to March 2021 on the Animeism programming block.
Hidden dungeons are a place of legends where rare treasures and items are concealed. Some are lucky to find them, like Noir Stardia, the third son of a minor noble family, who acquires an exceptional skill that provides him great knowledge. As a result, however, it causes him to have painful headaches. Noir is given a job offer by his childhood friend Emma Brightness, who has a cure for his headaches. After Noir encounters difficulty with employment, he wishes to become an adventurer and finds a dungeon and the legendary adventurer Olivia Servant, who has been trapped inside for centuries. Olivia gives Noir three powerful skills, which he uses to improve his power and enroll at the Hero Academy.
Originally serialized as a web novel on Shà Âsetsuka ni Narà Â, Kodansha published the first volume of the light novel series in print on August 1, 2017, under their Kodansha Ranobe Books imprint. The series is licensed in North America by Seven Seas Entertainment.
A manga adaptation by Tomoyuki Hino was serialized on Kodansha's Niconico-based Suiyà Âbi no Sirius manga service from May 2, 2018, to June 20, 2023. Kodansha has compiled its chapters into individual volumes. Twelve volumes were published from December 6, 2018, to April 9, 2024. Seven Seas Entertainment has also licensed the manga and published the first volume on November 17, 2020.
An anime television series adaptation was announced by Kodansha on May 8, 2020. The series was animated by Okuruto Noboru and directed by Kenta à Ânishi, with Kenta Ihara handling series composition, and Yuya Uetake designing the characters. The series aired from January 9 to March 27, 2021, on the Animeism block on MBS, TBS, BS-TBS, and AT-X, with Crunchyroll streaming the series worldwide outside of Asia. In Southeast Asia, Bilibili streamed the series. The opening theme song (from episode 2 onwards) is performed by Spira Spica, while the ending theme song is performed by COALAMODE. The series ran for 12 episodes. On February 8, 2021, Crunchyroll announced the series would receive an English dub, which premiered on February 26.