Black Angel [akutagawa x oc]

In a city shadowed by dangerous organizations, Akane-a fierce, haunted assassin-has known nothing but darkness. Forced into a life of brutality after her parents were murdered by the Port Mafia, she was taken in by Morariti, the ruthless leader of Silent Winds. He molded her into a weapon, using her flame-based ability to make her the most feared enforcer in his organization. Her white flames can heal, her black flames are unstoppable-and under Morariti's cruel guidance, she learned to wield them without mercy.

But Akane's world shifts when she encounters Kiyoka, a young girl with a similar tragic past, and defies her mission orders to spare her life. This act of compassion seals her fate, leading to severe punishment and isolation. Just as she's about to lose hope, an unexpected rescue by Dazai Osamu and Akutagawa Ryuunosuke of the Port Mafia thrusts her into an uncertain future.
Thinking she had escaped her hellish life in the silent winds not knowing what's coming next.