Hiroki Miyashita is a Japanese manga artist and writer known for creating series that blend science fiction, action, supernatural elements, and comedy. Born in Ishikawa Prefecture, he graduated from Tokai University before working as an assistant to several established manga creators, including Yowoko Nihonbashi, Koichi Kiba, and Erichin. He gained early recognition in 2002 when he won an excellence award in the 8th GX Newcomer Award competition, leading to his professional debut in 2004 with the work Porapiredon.

Miyashita first attracted significant attention with the series Seigi Keikan Monju, which began serialization in 2004 and concluded in 2011. This series, published in French as Monju, au service de la justice, helped establish his reputation for crafting narratives that combine action-oriented storytelling with humorous undertones. Following this success, he continued to produce a variety of manga, including Kyousei Hero, Ryuuma no Gagou, Tokyo Karasu, and Kettou Saiban. His artistic skills have been recognized through his participation in Pixiv, a platform that highlights notable Japanese illustrators.

His most recent major work is Me and the Alien MuuMuu, a manga series that began as a one-shot in the magazine Young King OURs in April 2019 before launching as a full serialization in June of the same year. The story follows a cat-like alien who arrives on Earth to study home appliance technology, leading to chaotic and comedic situations with a female university student. The series has been collected into multiple tankobon volumes, with seven released as of May 2024.

An anime television adaptation of Me and the Alien MuuMuu premiered in April 2025. Produced by OLM, the anime adaptation represents the growing recognition of Miyashita’s work, bringing his storytelling to a broader audience. His career demonstrates a consistent focus on original creations, with his authorship spanning both the writing and illustration of his manga.