Ninja, this is a well-known existence.

There are some non-direct descriptions of ninjas in both novels and cartoons.

But few people think that ninjas really exist, which is beyond the scope of too many ordinary people after all.

But Ichido knows that ninjas are not only there, but also very, very powerful.

There are five Ninja families in Japan, and these five families can be said to be in charge of the lifeblood of the whole country, regardless of the economy, the right path, the underworld, all of them have their shadow.

Like the Yamamoto family Ito is now serving, it is one of the five most famous families in...