Hell and Heaven

In this world, besides ordinary humans, there is another kind of person. They are inseparable from one another. One has words imbued with great power, while the other has absolute control over their attacker, but must also bear the enemy's injuries. The attacker is known as a Fighter. The one who takes the injuries is known as a Sacrifice.

Aoyagi Ritsuka is a sixth-grade elementary school student, burdened by a painful past no one knows about. His only trusted family member, his older brother Aoyagi Seimei, dies mysteriously, leaving behind the Fighter Agatsuma Soubi and giving him to Ritsuka. To avenge his brother, Ritsuka sets out with Soubi on a journey through hell and heaven. Along the way, he also meets the mysterious companions Himemiyuri and Sanatsuka Yui...