Kosuke was born in Tokyo, attended a school for the deaf, and now lives in Yokohama. He is a busy person and like a tuna fish he cannot keep still for long. But he prides himself in his ability to fall asleep in 3 seconds.

In high school he met Harumi Kimura and found his vocation — Deaf education. He took part in the launch of Tatsunoko Gakuen (Meisei Gakuen's predecessor) in 1999, spent 8 years preparing, utilized Tokyo's "Special Zone for Structural Reform" scheme, and established Meisei Gakuen in 2008 in Yashio, Shinagawa, Tokyo. For 3 years until 2016, he was assistant principal at Meisei and now is manager of "Medaka" Pre-school at Meisei Gakuen* and teacher at the elementary school. (*Child Development Support Office). He is also an anchor for NHK's Sign Language News.

His wife and two sons are hearing and as a Deaf father he is keen on raising his children.