Tenseisha no Watashi ni Idonde Kuru Mubou de Yubou na Shoujo no Hanashi

“A prodigy at ten, a genius at fifteen, an ordinary man past twenty.” This old saying perfectly captures the life of the protagonist, a reincarnator who once believed his retained memories from a past life would guarantee him lasting greatness. Armed with knowledge beyond his years, he coasted through childhood as a celebrated talent. However, as time passed and the natural brilliance of those around him matured, his early advantage faded entirely. Now in his twenties, he has been reduced to nothing more than an average person, quietly struggling to find his place in a world that no longer views him as special. His unremarkable existence is suddenly thrown into turmoil by the arrival of a brilliant young girl. Unlike him, she is a true, native-born genius whose potential seems boundless. Yet, despite her extraordinary gifts, she is utterly reckless, charging headlong into challenges without a second thought. For reasons he cannot fully understand, this promising prodigy decides to fixate on him, relentlessly challenging the former reincarnator to prove herself against his faded reputation. Caught between the lingering expectations of his past identity and the reality of his current mediocrity, he finds himself dragged into her whirlwind. What follows is a compelling story of struggle and rivalry, pitting an ordinary man burdened by a past life against a fearless, talented girl determined to test her limits against him.