It is a subsidiary of Sony Music Entertainment Japan's anime production firm Aniplex.

[4][5] In 2006, it co-produced the original production Zenmai Zamurai, and in October of the same year, established a studio in Asagaya.

[7] Three anime series were produced that year for the project: Sound of the Sky, Night Raid 1931 and Occult Academy.

[8][9] On October 1, 2018, CloverWorks separated from A-1 Pictures, although it still remains as a subsidiary under Aniplex.

[10] On June 17, 2024, the studio 3Hz announced that its animation planning and production business was transferred to A-1 Pictures.