The ruins were excavated when constructing the athletics and exercise area of Rikkyo University (立教大学, Rikkyō daigaku) in 1955.

In a survey conducted between 1955 and 1956, stone tools made of obsidian were excavated from the red soil (Kantō Plain loam), and were found to be from the Paleolithic age.

Jōmon pottery was recovered, and the site exhibits trace evidence of pit dwellings from the Yayoi through the Heian periods (300 BC–1185 AD).

The replica structure depicts a pit-dwelling from around the beginning of the 8th century, the early Nara period (CE 710 to 794).

The remnants of the dwelling were dug down to a depth of 50 cm, and four pillar holes and a clay pot were identified to the north.