Shiho was once a brilliant neurosurgeon—until a sudden hallucination during surgery forced her to walk away from the operating room. Just when it seemed her medical career was over, the director of Toko University Hospital, recognizing her exceptional talent, offered her a second chance: a position in the elite Analysis and Diagnostics Department.

Now, as a diagnostician, Shiho tackles the toughest medical mysteries—cases that have stumped even the best doctors. With her unwavering sense of justice and fierce determination to save lives, she often clashes with others, but her passion is undeniable.

Joining a dynamic, all-female team of unconventional physicians, Shiho dives into a world of unsolved illnesses, emotional confrontations, and unexpected breakthroughs. Together, they unravel the secrets behind the most puzzling conditions—one diagnosis at a time.