Quantum is the credited author of the original Japanese light novel series I'm Quitting Heroing: Next Gig Is at the Demon Queen's Castle. The series began as a web novel serialized on the Kadokawa-operated user-generated content platform Kakuyomu, where it ran from January 12 to February 7, 2017. That same year, the story won the Grand Prix in the isekai fantasy category of a Kakuyomu web novel contest. Following this success, Quantum debuted as a published light novel author with Kadokawa. The light novel, illustrated by Hana Amano, was released in three volumes by Fujimi Shobo under their Kadokawa Books imprint from December 2017 to October 2018. The series was later reprinted under the Fujimi Fantasia Bunko imprint in 2022.

The property was subsequently adapted into multiple media formats. A manga adaptation illustrated by Nori Kazato ran on Kadokawa Shoten's Young Ace Up website from May 2018 to June 2023, compiled into eight volumes. An anime television series adaptation produced by EMT Squared aired from April to June 2022. Beyond this initial work, Quantum has continued working as an original story creator, serving as the credited original storywriter for the webtoon series The Genius Swordmaster Returns. No verifiable personal background information such as the creator's real name, age, or biographical details is publicly available.