After leaving Sunrise, he was put in charge of directing Hyperdimension Neptunia: The Animation in 2013, and Trickster in 2017.
Under the chief direction of Kenji Nagasaki, Mukai served as director for the anime adaptation of My Hero Academia from its fourth through sixth seasons.
Mukai was a fan of the Gundam series in elementary school, which later inspired him to work in the anime industry.
[1] Mukai left Sunrise around 2008, and following his departure from the company started working as an episode director.
[3] That same year, Mukai served as episode director for the second season of Blood Blockade Battlefront.