据笠实1954年11月笔供，他1906年生于日本福冈县，华名李实。1939年来华，曾任伪山西省临汾县公署财务辅佐官、壶关县政府顾问等职。
重要罪行有：
1939年11月，在河南中牟县某村，“捕虏2名中央军”，因其“途中不能步行，在田地里刺死了”。
1943年11月25日—1945年8月15日，“我任壶关县政府顾问时，因为收夺食粮和轻重工业原料，饿死了该县的和平居民150名”。“掠夺了一城和58个村的谷、高粱、小麦、玉米等食粮，合计1087万斤，羊毛约8000斤，羊皮约500张，牛皮约30张”。
1943年12月，率部袭击壶关县土河村，“逮捕了在村庄南边哨兵屋内睡着的1名民兵，我将他就地交给松田中尉。次日下午2时左右被原田准尉斩杀了”。
1944年6月—10月，“讨伐壶关禾登村。……作战中在该村杀害指导员1名和民兵10名。”
1945年2月，“逮捕了县政府教育主任陈某，新民小学校校长张士达和其他公务员6名”，命县长“杀害上记的家伙”。
1945年2月，命令壶关县县长进攻土河村，“杀害了该村民兵18名”。同月，命令进攻刘寨村，“将该村村民14名烧死在一个房屋内”。
1945年3月，命令部下“讨伐壶关三王头村”，“日军用轻机枪扫射，射死了和平居民19名”。
笔供英文内容提要(Abstract of the Written Confessions in English)
Kasa Jitsu(笠实)
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.
Major offences:
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”.
