Born into a unique world where villages fight to gain power and control, the main character, Shi Hao, is a genius blessed by the heavens born under the poorest of conditions. His clan, however, has a mysterious past. To rise up and become the genius he is meant to be, the clan goes through every effort to aid his cultivation as they battle through fanatical monsters and engage in power struggles with other clans. His journey will bring him through unknown lands until he is able to become a person that can truly shake the world.

忍者は、存在しない。…と、我々は思っている。

仮に忍者が存在したところで、忍者はその姿を我々に晒すことはない。

だからこそ、忍者は『表向きには』存在しないのだ。

主人公、櫻羽一時は、我々と同じく忍者は存在しないと思っている、普通の男子。

彼には普通の、幸せで輝かしい日々が約束されている…はずだった。

ある日、一時は命を狙われ、それが甲賀忍者の仕業であると聞かされる。

なぜ一時は命を狙われたのか？それは…彼が由緒正しき、伊賀忍者第１９代正当後継者だったからなのだ！

伊賀と甲賀は長年対立しており、甲賀は伊賀を侵略しようとしている。

一時が生きるためには…自らも忍者になるしかない！

こうして、誰も知らない忍者の世界に身を投じる一時。

一人前の忍者となるべく学び、戦い、苦難に立ち向かう。

だがそれは、一時が辿る過酷な運命の、ほんの序章でしかなかった…。

The main character begins a dangerous journey of human against nature to find an antidote to save his master Shifu by traveling to a faraway land where he makes friends with a few key characters. ~~ Adapted from the novel written by Tian Xia Ba Chang following the rivalry of two hunting clans at the end of the 80s.

Thousands of years ago, the 5 Kings guarded the land of the Xia Dynasty with magic artifacts. Later, the leader of the Dragon Clan, Zu Long, helped humanity by establishing the Yun Chui Empire. The empire overlooks the calm ocean where Xi and the Black Water Clan have maintained it for 1,000 years in peace. Now, waves are surging from below and chaos will rise once again.