Koji Nagai was born and raised in Hiroshima, Japan. He studied graphic design at Hiroshima Designer College. After working at several design companies, he became a freelance designer at age of twenty-four. Nagai earned a wide variety of awards from Hiroshima Advertising Association for his design works in posters, brochures, and calendars. At age of thirty-five, Nagai was attracted to the world of free spirit of the collage design. Nagai generates ideas for his collage arts based on his first impression of the materials. The interfusion of the different types of elements, which are old and new, fiction and nonfiction, life and death, and western and oriental leads to Nagai’s new design creation of the collage arts. Nagai currently lives in Hiroshima with his partner, Naoko Sakuma.