Hiroyuki Yamamoto

Eikoh Inc. engages in the education business. It manages cram schools and offers professional teaching in language and specialized education. The company was founded in July 1980 and is headquartered in Tokyo, Japan.

Zoshinkai Holdings, Inc. engages in the provision of correspondence education services. It manages and operates cram schools, publishes textbooks and workbooks, and provides educational materials and mock tests. The company was founded by Yutaka Fujii in 1931 and is headquartered in Sunto, Japan.

Z-kai Inc. engages in the operation of communication education business, publishing business, mock test services and cram schools. The company was founded in 2000 and is headquartered in Sunto, Japan.

MYFRONTIER KK engages in the operation of cram schools. Its main school is known as Masudajuku. It helps students study for college university entrance exams. The company was founded in 2001 and is headquartered in Tokyo, Japan.