Yoshihiro Tatsumi was a Japanese manga artist whose work was first published in his teens, and continued through the rest of his life. He is widely credited with starting the gekiga style of alternative manga in Japan, having allegedly coined the term in 1957. His work frequently illustrated the darker elements of life.

Gekiga is a style of Japanese comics aimed at adult audiences and marked by a more cinematic art style and more mature themes. Gekiga was the predominant style of adult comics in Japan in the 1960s and 1970s. It is aesthetically defined by sharp angles, dark hatching, and gritty lines, and thematically by realism, social engagement, maturity, and masculinity.