Maruishi-shin refers to the worship of circular or oval "stones" found only in the Yamanashi Prefecture and its surrounding areas. They are venerated as guardian deities enshrined within home properties or as Doso-jin (road gods) located at crossroads and open spaces. It is believed that this is a remnant of the Japanese people's natural worship of stones since the Jomon period, but a detailed academic analysis has yet to be conducted, making it a mysterious folk belief. This item was enshrined as a guardian deity in an old house in the Enzan area of Yamanashi Prefecture, the heartland of Maruishi-shin worship. This is a rare item that allows you to feel the natural worship of the Jomon period, known only to those in the know. The characters "Yamamiya" are written on the bottom of the round stone, but the details are unknown. For those who are interested, what do you think? Thank you for viewing.