In response to an idea generated by Reverend Koshin, zasu (a head priest of a temple) of Hase-dera Temple, artist monks gathered from all over the country to paint Kannon Bosatsu (Kannon Buddhisattva), which is honzon (principal object of worship at a temple) of the temple, on a sheet of paper, as large as the entire hondo (main hall), in hope that the conditions of the war-torn country would improve as much as possible.
長谷寺の座主・弘深上人の発案で、戦乱の世を少しでも良くするべく、本堂一杯の大きさの紙に寺の本尊である観音菩薩を描くことになり、全国から画僧たちが集まった。