When a samurai ruler is killed for treason, his strongest subordinate, the one who inherited the samurai's seal, seeks only for the truth.
Vengeance, bloodshed, innocence, crime and even disgust are heavily experienced.
Hanasuke, is a sideman of a dead samurai. He has inherited the mark of shunks, that was his sensei's mark of identity as a samurai. To understand the reason his master was brutally killed.
In the world below the sky is a whole new world. A world of death, destruction, chaos, betrayal and a world of pain.
In a world known to swordsmen, is represented as a plane flying under water. The term impossible is mere childness.
There are still people who pose huge threats to him. Different Kiminowa swords, different ranks in samurai statuses and skills. People using Reigen Kiminowa swords and others using Bone techniques known as Berserkers.