Arai Ōsui (新井奥邃) (1846–1922)[1] was a prominent Japanese disciple of the 19th century cult leader, Thomas Lake Harris.
Remaining on the northern island of Ezo (modern day Hokkaido) after the battle, he initially converted to Russian Orthodox Christianity, but became disillusioned.
After a meeting with Mori Arinori, he went to the USA to join Harris' Brotherhood of the New Life Brockton community in March 1871.
Having settled into Brocton, Arai went with Harris and Nagasawa to help found the Fountaingrove community in Santa Rosa, Sonoma County, California in 1875.
[3] He lived a quiet life of reflection in Tokyo, promoting among other things the place of women in society and publishing several pamphlets, such as Inward Prayer and Fragments[4] and newsletters.