He is known for his collaborations with manga writer Kazuo Koike, the most famous of them being Lone Wolf and Cub.
[1] After getting out of junior high school, Kojima painted advertising posters for movie theaters as his source of income.
The post-World War II environment led to forms of manga meant for impoverished audiences.
[1] In 1970, he and writer Kazuo Koike created Kozure Okami (Lone Wolf and Cub),[1] the first and most famous of their four major collaborations.
In his later years, Kojima adapted some of the films of his favorite director, Akira Kurosawa, into graphic novels.