Fukasaku was not a morning person, feeling better at night, and because filming continued until early hours, it was said that the 'Fuka-saku group' stood for 'Shinya-Sagyo group' ('late night work').
朝に弱く、夜になると調子が出てきて、撮影が毎日深夜まで続くため、「深作組＝深夜作業組の略」とも言われた。