They are regarded as documents that approved Nikko as the successor of each and every teaching by Nichiren (So-fuzokusho (total document for entrustment)) and decided Nikko as the chief priest of Kuon-ji Temple on Mt. Minobu (Betsu-fuzokusho).
日蓮の一切の法の継承者であること（総付嘱書）と、身延山久遠寺の住職であると定めた（別付嘱書）とされる書状のこと。