Hikari Natsukawa, a female doctor working at a university hospital, strongly opposes Professor Hiruma's attempts to cover up a medical error. As she strives to uncover the truth, she is cornered by Hiruma's authority and her husband's betrayal. Expelled from the hospital and severed from her family, she remains determined to uphold her principles. However, mounting schemes and pressure from those around her continue to drive Hikari into deeper despair, intensifying the story's dark descent.