In Japan, there are three martial arts schools: one is Sword Dao, one is Ninjutsu, and the third is Shinto. There are also some subtle connections between the three.
For example, ninjas who also practice Sword Dao, and swordsmen and ninjas, ultimately pursue Shinto.
Shinto is above both Sword Dao and Ninjutsu.
Of course, Shinto is just a legend, a very ancient legend. Nowadays in Japan, only Sword Dao and Ninjutsu continue to thrive.
Tadeo Ono, an eleventh-degree master of the Ono Sword Dao Clan. It is well known that the Japan Kendo Association only rates swordsmanship up to eighth dan, as ninth dan and above are not assessable because they are too powerful.
Tadeo Ono is one of the three leading figures in Japan's Sword Dao school, and the Ono Clan is very famous in Japan not because of Yoko Ono's grandfather Ichiro Ono, but because of this Tadeo Ono.
Legend has it that he is a Sword Dao genius, and before the age of forty, he had reached the pinnacle of martial arts in Japan.