Nagase Brothers, Inc. engages in education related business. It operates in the following segments: High School, Elementary and Junior High School, Swimming School, Business School, and Others. The High School segment handles Toshin High School, Toshin Eisei Yobiko, and Waseda Juku. The Elementary and Junior High School segment manages Yotsuya Otsuka schools. The Swimming School segment operates the Itoman swimming school. The Business School segment includes training for university students and private individuals. The Others segment covers publishing business. The company was founded in March 1971 and is headquartered in Musashino, Japan.