Saioshi no Gikei wo Mederu Tame, Nagaiki shimasu!

Reborn as Alba, the sickly son of a poor nobleman, life seems bleak. Cursed with a frail body that can't use magic and destined for an early grave, his fate takes an unexpected turn when he's taken in by a powerful duke. There, he meets Orsis—the very person he admired most in his previous life. But this dream reunion is shattered by a crushing revelation: Alba remembers he is the reason his beloved will one day lose his smile. Driven by desperate love and profound regret, Alba must now defy his own tragic fate and find a way to live long enough to protect the happiness of the one he cherishes most.