Journalist Kenji Goto's efforts to aid people living in conflict zones may have gone widely unnoticed if his kidnapping and beheading by the Islamic State militant group had not caused outrage worldwide last month.

But in the wake of his tragic death, an exhibition in Tokyo has included a piece of artwork created jointly by Goto and graphic artist Nakaba Kozu in 2010, which highlights their efforts to show the plight of those living amid war, especially children.

"Broken boy," a collage depicting the face of a boy killed in Liberia's civil war, is on display at the ongoing "Flowers of Lives" exhibition at Gallery Hibiya in Tokyo's Chiyoda Ward until Wednesday.