Shiro Buta Kizoku Desu Ga Zense No Kioku Ga Haeta Node Hiyoko Na Otōto Sodatemasu Manga [portable] Link

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.

Fantasy, Slice of Life, Reincarnation/Isekai, Family Drama, Comedy, Redemption A deceptively gentle manga about the hardest kind

Using his past-life knowledge, Regulus makes a solemn vow: He’ll lose the “white pig” weight through proper nutrition and exercise, outmaneuver the scheming adults who want him dead, and—most importantly—raise Luciel into a strong, kind, and confident young man. From cooking homemade meals and teaching basic math to confronting abusive tutors and planting secret vegetable gardens, Regulus builds a quiet revolution inside the gilded cage of nobility. Slice of Life