Asai became the first instructor to introduce karate to Taiwan. Through the second half of the 1960s, he taught karate in Hawaii for five years, with his students including Kenneth Funakoshi (a fourth cousin to Gichin Funakoshi).
Asai was the pioneer who introduced karate to Taiwan. During the second half of the 1960s, he taught karate in Hawaii for five years, and among his students were Kenneth Funakoshi, a distant relative of Gichin Funakoshi.