The Shimada clan is a clan of ninja based at Shimada Castle, in Hanamura.

The clan was founded centuries ago during the end of the Sengoku period ,and operated out of Shimada Castle, with the town of Kanezaka serving as their seat of power. It operated on a system where the eldest son of the family's head would become leader.

While they were criminals, the Shimada understood that honor and loyalty forge the strongest bond between ruler and ruled. They asked much of those who followed them, but they inspired them to give it. And in return, the Shimada clan led with integrity and treated the people of Kanezaka with respect.

The Shimada's power grew over the years, enabling them to build a vast criminal empire that profited from lucrative trade in arms, illegal substances, and assassination.