Wakō, Saitama

• Tobu Railway - Tobu Tojo Line
• Tokyo Metro - Yūrakuchō Line/Fukutoshin Line
  • Wakōshi

• Tokyo Gaikan Expressway
• Japan National Route 254
• Japan National Route 298

This temple was consecrated by Sudagoro Tokimitsu, the local administrator of Shimoniikura (1278–1287). A statue of Nichiren and a wooden plaque with the inscription: "Namu myoho rengekyo" reside in the temple. They are important treasures of Wakō city.

Per local legend, Nichiren called at the house of his old friend, Tokimitsu while on his way to exile in Sado. Tokimitsu's wife was going through a difficult childbirth. When Nichiren prayed for a safe delivery and made a blessing with a willow twig a spring of pure water sprang up on the spot. Nichiren then had Tokimitu's wife hold the willow twig while water from the spring was poured into her mouth whereupon she soon gave birth to a healthy baby boy. There used to be a large willow tree beside the pond at the temple, and it is said that this tree grew from the twig that Nichiren used to bless the birth. The tree is no longer there today.

The Kawagoe Kaidō was a highway completed in 1633 when the third shōgun Tokugawa Iemitsu visited Kawagoe Senpa Tōshōgū (Shinto shrine). At that time, Kawagoe Castle played an important role in governing the northern part of Musashi Province. Kawagoe was 10 Ri (about 40 kilometres (25 mi)) from Nihonbashi in the old part of Edo and there were six shukuba along the way, namely: Kamiitabashi, Shimonerima, Shirako, Hizaori, Ōwada, and Ōi. These post stations were officially regulated settlements catering to travelers. Shirako-juku was 20 kilometres (12 mi) from Edo and travelers often stopped there for lunch. After a steep winding hill and with ample spring water, Shirako-juku was a good rest stop. Travelers came from the direction of Nittazaka then went up O-saka and down Kurayami-zaka, which was dark even in the daytime.

The origin of this Shingon sect temple pre-dates the Edo period. The temple was dedicated to the Juichimen Kannon (Kannon with eleven faces). The wooden statue may have been made at the beginning of the Edo period. There is a huge Ginkgo tree in the temple grounds. The tree is estimated to be over 700 years old, has a diameter of more than 7.5 meters and stands nearly 30 meters tall. It is designated as a natural monument of the Wako City.

Ikkan-ji is a Sōtō sect temple built during the Kan'ei era (1624–43) and was consecrated by Sakai Tadashige, a local administrator of Shimoniikura in the Edo period. It served as the family temple of the Sakai clan. Gorintō, or stone five level pagodas were placed at graves as a memorial and to console the spirits of the departed. Three gorinto can be found at Ikkan-ji at the graves of Tadashige Sakai, his wife, and a former administrator's wife.