: The "chick" referenced in the title ( hiyoko ), Regulus is the ultimate engine of cuteness in the series. His pure bond with Ageha completely dismantles the dark path he was originally meant to walk. The manga excels at showing how unconditional brotherly support can entirely rewrite a person's nature.
The series is noted for its "slice-of-life" fantasy elements, focusing on brotherly bonds and territorial development rather than high-stakes action.
Ageha’s younger brother. He is timid, innocent, and deeply attached to Ageha, viewing him as his protector and role model.
Shiro Buta Kizoku desu ga Zense no Kioku ga Haeta node Hiyoko na Otōto Sodatemasu (also known as
While the manga shows Phil losing weight for health, it never shames her former body. Instead, it criticizes the society that created her. "White Pig" is a slur used to dehumanize her. The story’s message is: You were a victim of neglect, too. Phil’s journey is about taking control, not conforming to beauty standards for a man—but for survival.
The manga excels at world-building that feels genuinely oppressive. The Arbellux family is not merely "strict"; they are emotionally bankrupt.
Ageha does not rely on overpowered cheat magic to solve his problems. Instead, his weapons are domestic arts. Using his past-life knowledge, he introduces innovative recipes to improve nutrition, sews clothes, and bonds with people through classical German and Japanese songs (such as singing "Heidenröslein" in the garden). These wholesome actions gradually win over the cold, untrustworthy servants and knights of the household. 2. The Wholesome Brotherly Bond
“I fell down the stairs and hit my head.”
Look for fan translations under the shorthand "White Pig Noble" or the official licensing attempts by digital platforms (check Seven Seas or J-Novel Club, as they often pick up these niche isekai titles).
Upon regaining his consciousness, he realizes a terrifying truth about his new reality. In the original timeline, his neglectful, abusive up-bringing would turn him into a tyrannical, corrupt "white pig" of a nobleman. More critically, he discovers that his adorable, soft half-brother, (whom Ageha lovingly refers to as his "baby chick"), is destined to eventually kill him in a bloody feud over the family's succession rights.
“From the merchant district. A retired mathematician, a poet who used to teach at the Royal Academy before his politics got him fired, and a young woman from the eastern provinces who trains horses. She’ll teach him geometry and also how to ride without falling off every five minutes.”
However, everything changes when Regina suddenly recalls memories of her as a modern-day Japanese woman—a kind, ordinary, and hardworking person. Overwhelmed with shame and regret for her current behavior, she resolves to completely reform herself and, most importantly, protect and properly raise her little brother, who has been neglected and abused by their family.
This is a Japanese web novel turned manga series. The story follows a noble girl reincarnated as the villainess "white pig" archetype, but she retains memories of her past life. Using that knowledge, she raises her younger brother carefully to avoid ruinous futures.