Okahara traveled hidden ex-leprosy colonies in China with his friend, a researcher, Takeshi Nishio to witness the death of a disease. One of the villages was located the other side of a river which takes only 10 minutes to cross. it felt them strange to know that the villagers had not crossed it for decades.

| Related Art book: Vanishing existence / Special edition / Oban edition

“Title calligraphy drawn by Misato Ichino”  Vanishing existence has 3 different forms of artist books in order to express the history (context) of the disease. One is a stab binding book, another one is 10m scroll book, and the last one is 100x70cm gigantic stab binding book.