Kase is from Sumida, Tokyo and began judo at Kodokan at the age of a 4th grader.[1] He belonged to Keiyo Gas Co., Ltd after graduation from Meiji University in 1977.[1]
In 1981, he won a silver medal at the World Championships held in Maastricht. He also participated All-Japan Championships 5 times from 1977 to 1985.[1]
As of 2010, Kase coaches judo at Keiyo Gas.
- All-Japan University Championships (-78 kg) 1st
- Kodokan Cup (-60 kg) 2nd
- All-Japan Selected Championships (-78 kg) 3rd
- Kodokan Cup (-60 kg) 3rd
- Pacific Rim Championships (-78 kg) 1st
- All-Japan Selected Championships (-78 kg) 1st
- Kodokan Cup (-60 kg) 3rd
- Kodokan Cup (-60 kg) 2nd
- Kodokan Cup (-60 kg) 1st