In Order to Love My Most Beloved Brother-In-Law, I'll Live a Long Life!

Alba was reincarnated as the son of a poor noble family. In his new life, he is introduced to his new step-brother Orsis, through his mother's second marriage. Orsis happens to be Alba's favorite character from an otome game he played in his previous life. Alba is ecstatic until he realizes his own character's death is the reason his step-brother loses his smile. Alba is determined to find a way to live longer.