Hiroaki Nagashima is a Japanese author and creator known for originating the fantasy franchise Good Bye, Dragon Life. His work as a writer began with the web novel series Sayōnara Ryūsei, Konnichiwa Jinsei, which first appeared on the user-generated platform Shōsetsuka ni Narō in January 2013. This initial online serialization ran until August 2016, after which it moved to the AlphaPolis website. The story proved successful enough to be picked up for print publication, with AlphaPolis releasing the first volume of a light novel adaptation in April 2015, featuring illustrations by Kisuke Ichimaru. As of September 2024, the light novel series has expanded to encompass 25 volumes, indicating a sustained creative output.

The franchise expanded into manga when Nagashima collaborated with artist Kurono for a serialized adaptation, which began in December 2015 on AlphaPolis' manga website. The manga version, for which Nagashima is credited with the original story, has been collected into multiple tankōbon volumes, with the 13th volume released in September 2024. The title has also seen international distribution, with the manga being published digitally in English by Alpha Manga.

The most significant expansion of Nagashima's creation came with the anime television series adaptation of Good Bye, Dragon Life, which aired from October to December 2024. The series was produced by SynergySP and Vega Entertainment, with Kenichi Nishida directing and Naokatsu Tsuda handling series composition. Nagashima is credited as the original creator of the light novel upon which the anime is based. The adaptation brought his story of a divine dragon reincarnated as a human to a broader audience, marking a notable milestone in his career as an original creator.

Information regarding Nagashima's broader background, including biographical details or a wider bibliography of original works beyond this single franchise, is not prominently documented in available sources. Some databases list a screenwriter named Hiroaki Nagashima with credits on series such as Odekake Kozame and Tantei wa Mou, Shinde Iru, but it is unclear if this represents the same individual who authored Good Bye, Dragon Life, as the creator of the light novel series is not consistently credited with screenwriting duties on other projects. The central and most verifiable aspect of his public professional identity remains his role as the originator of the Good Bye, Dragon Life series across its various media formats.