However, as to why following generations will not recognize each other when they meet, this is because inside the house there is only one firebrand. As a way to confirm the person's identity, hold the firebrand so that you will not have doubts.

Furthermore, the Shoninki is the record of the lore of nusubito and is a family secret. As for the spread of ninjutsu, this generation it will become the house transmission of many nusubito families.