A tree couldn't be called as tree without the trunk , the leaves , and its branches. You can't even see a bus run without the tires , the machines inside it , and the gasoline. And you can never call yourself human without having families , friends , and not being in a community. But what does it take to be called a 'ninja'? Powers and special skills ? Can run fast? No. For us to be a Ninja is to grow with each other together. To never love without struggling. To never laugh without crying. To never win without losing. And to never stay without leaving. It is our own definition of how we became real ninjas. But these definitions changes over time. Who will stay and who will leave depends.