Blassreiter

Caught in a 150-year-long war, interstellar nations reach the pinnacle of strategic combat at the hands of two genius leaders. Reinhard of the Galactic Empire, and Yang of the Free Planets Alliance lead the charge from opposing fronts. Fighting is their destiny, but in this vast universe torn by political intrigue, their greatest enemy may not be each other.

When a shapeshifting demon with a thirst for human flesh, known as "youma," arrives in Raki's village, a lone woman with silver eyes walks into town with only a sword upon her back. She is a "Claymore," a being manufactured as half-human and half-youma, for the express purpose of exterminating these monsters. After Raki's family is killed, the Claymore saves his life, but he is subsequently banished from his home. With nowhere else to go, Raki finds the Claymore, known as Clare, and decides to follow her on her journeys. As the pair travel from town to town, defeating youma along the way, more about Clare's organization and her fellow warriors comes to light. With every town cleansed and every demon destroyed, they come closer to the youma on which Clare has sought vengeance ever since she chose to become a Claymore.

Humans and katawara are at war, but there are those on each side who join forces. Tama is a fox spirit who loves humans, while her sendou brother, Jinka, despises them. Together, they use the power of spirit transformation to defeat the monstrous katawara and put an end to the evils of this chaotic age. What destiny awaits the duo at the end of their journey?

A supernatural system allows people to take revenge by having other people sent to Hell via the services of a mysterious entity and her assistants who implement this system. Revenge, injustice, hatred, and the nature of human emotions are common themes throughout the series.