The Uchiha Who Refused His System (And Got Stuck at 30)

Transmigrated into Uchiha Gin, a notoriously useless Uchiha in the brutal Warring States period, the modern protagonist faces immediate death. Weaker than a ten-year-old Madara, despised by his clan, and thrust into a mission to assassinate Senju children, his future seems bleak and short-lived. He yearns for a cheat, a system, anything to survive this bloody era. Then, it arrived. But not as expected. \"Ding, host's strong dislike detected. Age locked at 30. System enters cooling down period.\" His refusal to accept the system's aid had unforeseen consequences: he's now cursed with eternal youth, forced to experience decades, even centuries, of the ninja world's most brutal conflicts, all while looking perpetually 30 and stuck as a genin. His only path to unlocking true power and breaking this strange curse lies in completing the very tasks he initially rejected. Will this unmotivated immortal truly outlive generations of Kages, participate in the Fourth Great Ninja War as a centenarian, and finally embrace the legendary path he's tried so hard to avoid?