Saioshi no Gikei wo Mederu Tame, Nagaiki shimasu!

Alba is reborn as the son of an impoverished noble family, but an illness leaves him unable to use magic and threatens to cut his new life short. When a ducal household takes him in, he meets Orsis, the person he adored above everyone else in his previous life, making his reincarnation feel almost impossibly fortunate.

His memories also carry a warning: Alba's short fate is tied to the future in which Orsis loses his smile. Refusing to wait for that outcome, Alba begins searching for a way to extend his life and rewrite the future he already knows. He is not chasing glory or magical power. He simply wants enough time to remain beside his favorite person and prevent the happiness he treasures from disappearing.