Rengebuji-temple is used by the Chizan sect of the Shingon religion, located in Sado City, Nigata prefecture. It is said that in the first year of the Daido period, 806, Kukai, who started the Shingon religion, established the temple. It is located facing the Demon Gate direction of Mt.Hiei in Kyoto, the northeast direction and considered unlucky, so he named the temple 'small-Mt.Hiei' in order to pacify the spirits. It is one of the three most important sanctuaries of the Shingon, the others being Kingou Temple and Muro Temple. It is said that Saga Emperor in the Heian period prayed there.

In Tokugawa period, it was the biggest temple on Sado island. It is said that mining officials from the Aikawa domain visited to pray there. The gold part of the temple was built in the Muromachi period, and is designated as a national important cultural property along with Kouhou and Kotu.

In the grounds of the so-called Hydrangea temple, about seven thousand hydrangea plants grow.
From June to July every year, the flowers are in full bloom and the view is very beautiful with water lilies and many tourists visit the temple.