Young Hiroki is training with his master, Sanjuro, when they receive word that the village has come under attack by bandits. Sanjuro orders Hiroki to stay as he leaves to fight. However, Sanjuro's daughter and Hiroki's love interest, Aiko, encourages Hiroki to help her father. After fighting through hordes of bandits, Hiroki sees his master and rushes to help, but is confronted by the bandit leader Kaguro.

Hiroki wounds him, but is defeated. Before Kaguro can kill Hiroki, Sanjuro confronts him and kills him at the cost of his own life. Before he dies, he has Hiroki swear to him that he will always protect Aiko and the village in this life and beyond. Years later, Hiroki is the main samurai for his village with Aiko as the village chief. They learn that a warlord is about to attack the village and has already attacked another nearby village.

Hiroki and some fellow soldiers go to investigate but are ambushed and Hiroki's men are captured. After fighting through the enemy forces, he confronts the second-in-command who has Hiroki's men killed in front of him. After defeating him, the enemy reveals that the warlord is already at the village destroying it. Hiroki rushes back to find the village on fire. He confronts the warlord revealed to be Kaguro.

Kaguro reveals that he already killed Aiko before he kills Hiroki. Hiroki's soul is now in Yomi where he chases after a spirit that looks like Aiko. When he catches up to the spirit, it transforms into a banshee. After defeating the banshee, it reveals itself to be Aiko's enraged spirit, which is now calm. Aiko reveals that it's possible for Hiroki to go back to the village and stop Kaguro, but he has to travel to the depths of Yomi to do it.

Hiroki agrees to do it and faces many trials including the spirits of his former men. Along with the enraged spirit of his master Sanjuro. After overcoming many dangers, he's confronted with a spirit that takes on his own form. After defeating it the spirit ask him what is his true path. After answering, the spirit sends him back to the village where he confronts Kaguro once more. Kaguro reveals that he did in fact die back then and made the same trip through Yomi and stole the spirits' powers for himself.

After defeating Kaguro once and for all one of three endings happens based on what path you choose. If you choose Love, Hiroki will hear Aiko calling him back to Yomi and he returns to spend eternity with her. If you choose Duty, Hiroki will stay at the village to be its protector forever and will train his own apprentice. If you choose Hatred, Hiroki will take Kaguro's armor and army to become a warlord himself.

There is also a fourth ending if you manage to defeat Kaguro back in Chapter 3. Hiroki will find Aiko's dead body and realize he has no purpose anymore and sets out to find a new one.