Shiro Buta Kizoku desu ga Zense no Kioku ga Haeta node Hiyoko na Otōto Sodatemasu (“I’m a White Pig Noble, but I’ve Gained Memories of My Past Life, So I’ll Raise My Chick-Like Younger Brother”)
A deceptively gentle manga about the hardest kind of courage: changing yourself to save someone who has no reason to trust you. Highly recommended for readers who like their isekai low-fantasy, high-emotion, and heavy on the domestic fluff earned through pain. Shiro Buta Kizoku desu ga Zense no Kioku
But as Luciel begins to smile and speak more, their parents grow suspicious. The engagement to a cruel noble girl looms. And someone from Regulus’s original “bad future” timeline seems to have noticed the changes… detailed write-up for the manga:
Here’s a solid, detailed write-up for the manga: Shiro Buta Kizoku desu ga Zense no Kioku