Yuuichirou Hayashi started his career at Studio Live working on outsourced episodes for a few years. His first major role was as mechanical designer on the short series The Cosmopolitan Prayers.

After leaving Studio Live he was involved in several Studio 4°C and MADHOUSE projects, with the former studio housing his debut as director on the short TOYOTA commercial series PES: Peace Eco Smiles.

He's been affiliated with Studio MAPPA since 2014 where he helmed his first TV Series, Garo: The Animation, and several other anime.