Shokei Matsui

, also known by his Korean name of Moon Jang-gyu , is a South Korean martial artist in Japan. He is the master of Kyokushin karate and current Kancho (Director) of the International Karate Organization Kyokushin-kaikan, faction of the International Karate Organization (IKO) founded by Mas Oyama (1923–1994).

Early life Matsui was born in 1963 and started training in Kyokushin karate at age 13. In May 1992, Matsui opened his own dojo in Asakusa, Tokyo, Matsui then became Kancho (Director). Following a dispute over the veracity of Oyama's will, Kyokushin karate as an organization divided into three main groups, led by Matsui, Kenji Midori, and Yoshikazu Matsushima.

Matsui is currently ranked 8th dan, Subsequently, Peter Chong parted ways with Matsui in 2018 and formed his own organization.

Tournament achievements Matsui's tournament achievements include: 1980 — placed 4th in the 12th All Japan Open Karate Championships, when he was just 17 1981 — took 3rd place in the All Japan Open Karate Championships 1982 — took 3rd place in the same event 1983 — placed 8th place in the same event 1984 — placed 3rd in the 3rd World Open Karate Tournament 1985 — placed 1st in the same event 1986 — placed 1st in the same event and completed 100 man kumite 1987 — won the 4th World Open Karate Tournament, becoming the youngest champion ever