Kei Inaigumi, a boy that suffered amnesia in young age and has voice in his head. He searched for his origin and how he became of it. He also has a power of Kuuga inside of him. He was dragged to a battle that will determine his very fate. Will he accept to abandon his happiness for others or to battle only for himself?

This is the story of the Shinobi. Many of their stories remain hidden and unnoticed throughout the ages. A new era brewing from the horizons as the battlefield of these Shinobis will be rougher and larger than ever before. Young crows that yearns for freedom and conflict of good and evil, this is their story and struggle that the Shinobi world will witness with this generation.