He is best known for his work on Sword Art Online, the anime series based on the light novel of the same name.
[2] He is an alumnus of Department of Visual Concept Planning, Osaka University of Arts.
At first, he wanted to become a professional manga artist and joined a manga/anime research circle called 'CAS' while he was still in college.
He then decided to start his career in the animation industry as in-house animator at Xebec after Mitsuru Ishihara who was his senior in college invited him to join the company.
On December 31, 2021, it was announced that Adachi is making his directorial debut with the 2022 original television anime Lycoris Recoil at A-1 Pictures.