Demon Slayer: The Tsugikuni Clan's Crimson Blossom

She was meant to be a demon slayer—instead, she became the demon king's deadliest blade. Keiko Tsugikuni, eldest daughter of the legendary clan and sister to the creator of Sun Breathing, made a choice that would haunt history: she joined Muzan's ranks as Upper Moon One. Her brother Yoriichi once watched her like a flower bud waiting for spring, never imagining her bloom would be stained in blood. Surviving from the Warring States era to modern times, Keiko's journey from fragile human to immortal demon explores a question with no easy answer—when your body betrays you and death lurks at every…