Masahiro Yamazaki, born in Yokohama, Japan in 1953. He graduated from Hosei University in 1978 and worked as journalist for an industrial paper till 1984. Then, he changed his carrier and joined a software-developing company. He engaged in planning and sales of medical-software at the company for 14 years until he decided to establish his own company, the Rare Contents Co., Ltd in 1998.

The Rare Contents Co., Ltd, established in July, 1998.
c/o Nihonbashi Chuo-Bld. 7F
4-12-11 Honcho, Nihonbashi
Chuo-ku, Tokyo, Japan
TEL: +81-3-5623-2735, FAX: +81-3-5623-2736

The company profiles cover the planning of Web applications and various digital contents, business promotions and market research. The company participated in planning and developing a knowledge database called Dr. Brain with the cooperation of the SkyCom co., Ltd for avoiding medical accidents in 1999. The company developed communication tools, the Web System of My Health Diary in 2001, which helps communication between medical institutions and patients suffering from artificial dialysis. The product started to be sold in Japanese market from 2002.