Tatsumi Yukino, a young girl with a birthmark that has long marked her as an outsider, carries a mysterious past that could alter the course of history. Facing bullying and rumors that have left her isolated, she tries to remain hopeful, all while grappling with her own frailty. But when an unexpected connection to a powerful and ancient lineage is revealed, tatsumi's life takes a sudden and dangerous turn. As she uncovers her true potential, she must navigate a world filled with warring factions, secrets, and a destiny that she can't yet comprehend.