In the medieval Japan, Shichitorikoi was an action of a creditor, who could not receive compensation from a debtor living in a different region, to capture a third person who lived in the same region as the creditor (regardless of whether the person is acquainted with the debtor or not) or to privately confiscate the person's properties as compensation for the debt.
質取行為（しちとりこうい）とは、中世日本において、別の地域に住む債務者から弁済を受けられなかった債権者が、債務者と同一の地域に住む第三者（債務者との面識の有無は問わず）の身柄あるいは財物を債務の賠償として私的に差し押さえる行為。