Suruga doi
Suruga doi ( Japanese 駿 河 問 い , dt. "Suruga questioning"), also Suruga monjō ( 駿 河 問 状 ), describes both a torture method in premodern Japan and a practice from the field of BDSM .
It was introduced at the beginning of the Edo period and is said to go back to the city magistrate ( machi bugyō ) of Sumpu (today Shizuoka ) in the province of Suruga Hikosaka Mitsumasa ( 彦 坂 光 正 , first name: 九 兵衛 ; 1565-1632).
The torture method consists of hanging the person to be interrogated from the ceiling with his head towards the floor, with his hands and legs tied behind his back. In addition, the back was weighed down with a large stone.
Nowadays the method - without a stone - is used in the Shibari scene as a form of hanging bondage .