[2] His father, a forestry official, and maternal uncle told him about the Sankebetsu brown bear incident, which caused the most damage in Japanese history, when he was a child, and it left a strong impression on him.

[3] In August 1938, after enrolling in the manufacturing department of Hokkaido Government Otaru Fisheries School, currently Hokkaido Otaru Fisheries High School, he survived a bear attack on Paramushir, where he conducted practical training, that took one life, and since then he had been unable to escape his interest in bears.

[3] Once he graduated in 1939, he worked as a king crab inspector, but completed the training course's first type of Hokkaido Government Forestry and became one of these officers, just like his father and paternal grandfather, in 1941.

He conducted a field investigation and obtained testimonies from over thirty people, including those with knowledge of the incident and their sons.

Before his retirement, he worked at the offices of the Imperial Household Forestry Agency in Engaru, Nakatonbetsu, Ikutora, Horokanai, Kotanbetsu, Daisetsu, and Asahikawa.