Kawakami Gensai was born on 1834-12-25.

OK first things first hiten mitsurugi-ryu is a fictional style used by Kenshin Himura, a fictional character. Kenshin Himura is loosely based on Kawakami Gensai who is known as one of the four hitokiri of the Bakumatsu. Hiten mitsurugi-ryu is loosely based on Shiranui-ryu, a style developed by Kawakami Gensai that is characterized by high speed. From my current knowledge and research I can safely say that Shiranui-ryu is a lost art.

Masayuki Kawakatsu died on January 31, 2012, in Tokyo, Japan.

Bizan Kawakami has written:

'Kawakami Bizan'

Otojirō Kawakami was born in 1864.