He also criticized the interpretations by other disciples of Hōnen, particularly Kōsai and Shōkū, who emphasized the nembutsu over other practices.
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He also wrote The Way of Practice for Birth by the Nembutsu (nembutsu ojo shugyomon) to counter teachings from other disciples of Hōnen, particularly Kōsai and the "single-nembutsu" movement.
On March 23, 2010, Arai was merged into the expanded city of Kosai and thus no longer exists as an independent municipality.
On Feb 18th, 1977, H.Kosai and K.Hurukawa found a new asteroid (4963).