[Pleased to be asked a historical question so he can show off his knowledge of samurai, Sawamura's volume only increases.]

Famous samurai Hachimantaro was said to once discover natto while at war!! His camp was attacked suddenly while boiling soybeans for the horses and they had to pack them in a hurry into straw bags! The soldiers discovered the soybeans a few days later, sealed in the straw, and warmed up by the running horses and it made natto, which they then ate!

Since then natto is often served at breakfast so as to provide vital health benefits!!