This event is connected to Michizane SUGAWARA known as the god of learning, and it is assumed that the origin of the event were Shinto rituals of Kitano Tenmangu Shrine (Kyoto); leaves of mulberry paper are offered to an ink stone that had been washed and purified.
学問の神として知られる菅原道真にまつわる行事であり、洗い清めた硯にカジノキの葉を添えて供えた北野天満宮（京都府）の神事がその原型であるとされる。