Biology teacher, Tsunade

Dr. Tsunade Senju, a brilliant but jaded medical prodigy, finds herself inexplicably reincarnated into a mundane world as a high school biology teacher. Haunted by the echoes of her past failures and the crushing weight of lost loved ones, she grapples with an overwhelming sense of helplessness, her unparalleled medical knowledge rendered almost useless in a world without chakra. When a mysterious illness begins to sweep through her students, baffling modern medicine, Tsunade sees a chance to finally atone. But as she races against time, the lines between her past and present blur, revealing a sinister connection to her old life and forcing her to confront the very limits of her own power. Can she save them, or will history repeat itself?