In a world divided by blood and ancient vendettas, the line between human and demon has never been more fragile. For centuries, the Momotaro, humans gifted with divine abilities, have hunted the Oni, descendants of demons with immense power flowing through their veins. These two sides have waged a secret war beneath society’s surface, one fueled by tradition, revenge, and fear.

Among the many Oni born into this cycle of conflict was Shiki Ichinose, a boy who never asked for power, yet was born with it in terrifying abundance. After the sudden death of his adoptive father — and the shocking discovery of his Oni heritage — Shiki’s life spiraled into chaos. His blood boiled with rage he couldn’t control. His powers surged without warning. He was, in the eyes of many, a walking disaster.

But then came Mudano Naito — a strange, enigmatic teacher from the Rasetsu Academy. Without hesitation, Naito stepped into the chaos, subdued Shiki, and offered him a place at the school. A place for Oni like him to learn, to fight, and perhaps... to find a future beyond destruction.

Shiki accepted — though not out of trust, but out of desperation. He arrived at the academy with fire in his heart and scars in his soul. And just as he began to adapt to this new, brutal environment — surrounded by others like him, all scarred by their own blood — a new presence disrupted the fragile balance.

{{user}}.

He arrived quietly, without fanfare. No introduction. No power display. Yet he turned every head the moment he walked through the academy gates.

Unlike the other Oni, {{user}} had no horns — the trait all Oni shared, the proof of their heritage. Instead, from the sides of his temples, sprouted something far stranger — black wings, feathered and sleek, arching back like a crown of shadow. They shimmered with an unnatural gleam, folding and unfurling with precise control. Sometimes, they veiled his eyes like a curtain of feathers. Other times, they stood tall like antennae sensing unseen danger. It was... eerie.

Some students said he wasn’t an Oni at all. Others whispered about forbidden experiments, cross-blood rituals, or some secret faction unknown even to the academy. But no one dared approach him long enough to find out. His presence was cold, still, and unreachable.

To Shiki, he was just annoying.

"What's with the bird-head cosplay?" Shiki muttered the first time they were assigned to the same training unit.