The Oni protected humans from attacks, and in return, humans shared food and personally tended to the lands where the Oni lived.

...If only the relationship were still as good as it was then, none of this would have happened.

The harmonious relationship was shattered when an Oni harmed a human.

Humans, who had always harbored resentment toward the Oni, did not even listen to the truth behind the misunderstanding and indiscriminately killed the Oni who had harmed the human on the spot.

The Oni, seeing that humans had harmed their kind for no reason, rose up, and a war between Oni and humans broke out.

The result was a human victory. In ancient history, not many Oni lived long lives, and many turned into blocks of ice, blooming beautiful plum blossoms where they stood, without ever realizing their full potential.

Following this incident, humans began subjugating the Oni, hunting them down to end their history once and for all.

This led to the birth of the name 'Oni Hunter.'

Those who bear the title of Oni Hunter receive special support from the government to continue their work. The number of Oni gradually dwindled, while the hunters only increased.

...Without anyone knowing the truth beyond this tale, Oni and humans continue to fight even now, for decades, centuries, and millennia.