According to the written confession of Kasa Jitsu in November 1954, he was born in Fukuoka Prefecture, Japan in 1906 and had a Chinese name Li Shi. He came to China in 1939, and served successively as finance officer of government office in Linfen County, and government counselor in Huguan County, Shanxi Province etc.
November 1939: in a village in Zhongmou County, Henan Province, "captured 2 soldiers of the Central Army", because they "could not walk during the journey, they were stabbed to death in a field";
From 25 November 1943 to 15 August 1945: "While I was the government counselor of Huguan County, 150 civilian residents were starved to death because of the plunder of grain and materials for light and heavy industries"; "plundered a total of 5,435,000 kilograms of millet, sorghum, wheat and corn from one city and 58 villages, as well as about 4,000 kilograms of wool, about 500 sheepskins and about 30 cattle-hides";
December 1943: while leading the troops to assault Tuhe Village in Huguan County, "captured a militiaman who was sleeping in the guard house to the south of the village. I gave him to Lieutenant Matsuda. At around 2 pm the next day, he was killed by Warrant Officer Harada";
From June to October 1944: "while assaulting Hedeng Village, Huguan County…we killed a political instructor and 10 militiamen in combat";
February 1945: "arrested Chen, Director of Education Department of the local government, Zhang Shida, Principal of Xinmin Primary School, and 6 other civil servants", and ordered the county magistrate to "kill the above-mentioned guys";
February 1945: ordered the county magistrate of Huguan County to assault Tuhe Village, "killing 18 militiamen of the village"; in the same month, ordered the assault on Liuzhai Village, "burning to death 14 villagers in a house";
March 1945: ordered subordinates to "assault Sanwangtou Village, Huguan County", and "the Japanese soldiers used light machine guns to shoot local people, killing 19 civilians".