Butsuren was a priest of Anshōji Temple. He devoted himself to the Buddhist practices and recited the Hokekyō well. When middle-aged, Butsuren moved to Mt. Kukami of the Koshi District of Echigo Province. There he observed the precepts and never failed to maintain his manners and prestige.

Avoiding defilement, and desiring purity and cleanliness in mind and appearance, Butsuren bathed three times a day, wore clean clothes, recited the Hokekyō, and sought enlightenment. The person who served him became tired of preparing his baths three times a day and left him.

Then two boys appeared from nowhere and told Butsuren that they had come to help him. One was called Black Tooth, and the other was called Flower Tooth. Both were incarnations of Jūrasetsunyo.

These two boys were healthy and strong. They carried firewood on their backs, brought water to prepare the baths, picked berries and nuts for food, and carried supplies and ran errands between the mountain and the villages.

Thanks to these boys, the priest was entirely free from the annoyance of secular affairs and solely concentrated on his Hokekyō recitation. They remained with the priest to the end and served him most wholeheartedly. After the priest had passed away, the lamenting boys buried him, observed the mourning period of forty-nine days, and then left the mountain.