The story
ATG began as a distributor for foreign art films in Japan, with the Toho studio being its main financier and one of its initiators. By 1967, ATG was assisting with production costs for a number of new Japanese films. Some of the early films released by ATG include Shōhei Imamura's A Man Vanishes (1967), Nagisa Oshima's Diary Of A Shinjuku Thief (1968) and Death by Hanging (1968), Toshio Matsumoto's Funeral Parade of Roses (1969), and Akio Jissoji's Mujō (1970).
From Wikipedia’s article on Art Theatre Guild, shared under CC BY-SA 4.0.3