My Mangekyo Sharingan Can't Save My Hero Academia

Reincarnated with the Mangekyo Sharingan, a seemingly overpowered ability, the protagonist faces immediate limitations. The powerful eyes can only be maintained for brief periods before causing intense mental strain, and their chakra reserves are critically low. Furthermore, the system that granted these powers has become dormant. Tragedy strikes when the Hero Killer, an antagonist targeting "unworthy" heroes, incapacitates the protagonist's mother. With precise knowledge of the Hero Killer's next target and location, the protagonist has a mere four weeks to undergo intense training. This presents a stark challenge: transforming from an untrained individual to someone capable of facing a serial killer. Despite the logical choice to remain uninvolved and allow professional heroes to intervene, the fifteen-year-old protagonist, driven by anger and a shounen-like impulsiveness, chooses a different path. Enrolled in General Studies with minimal expectations, the protagonist grapples with the intertwined nature of heroism and personal vengeance.