The most interesting aspect of the shrine (神社, Jinja) is the En-kiri En-musubi Ishi (縁切り縁結び碑, lit. fate-severing, and fate-tying stone), a large stone that is 1.5m high and 3m wide, with a oval hole in the middle that good luck is said to pass through.
The stone is shaped like an Ema (絵馬, a board where people write their wishes), and covered in Katashiro (形代, a type of amulet) with people’s wishes on them such as “please let me happily marry OO-san (さん)”; or “please break the relationship of my husband and his mistress”.
To pray at the stone, first purchase the Katashiro on the left side of the stone. Write down your wish, like any relations you want to break off or want to protect, onto the Katashiro. Then as you hold onto the Katashiro, go through the whole in the stone, reciting the wish in your head as you pass through it from front to back. Then repeat the same process, passing from back to front, reciting the wish in your head. At the end, stick the Katashiro onto the stone at any location that you like.