3Hz Inc. (株式会社3Hz) was a Japanese animation studio established by ex-Kinema Citrus animators. Yuichiro Matsuka founded the studio in March 2013. The company is referred to as Studio 3 Hz in anime credits.
On June 17, 2024, 3 Hz announced that it had transferred its animation planning and production business to A-1 Pictures. The company added that its business will continue at A-1 Pictures. Studio 3 Hz and the official X account for the Sword Art Online Alternative: Gun Gale Online II anime confirmed the same staff who have been working on the anime will continue to work on the anime at A-1 Pictures.[1][2][3]