Shirobuta Kizoku desuga Zense no Kioku ga Haeta node Hiyoko na Otouto Sodatemasu

Ageha is born as the despised son of Count Kikunoi within the Qilin Empire, a unique realm where Western and Eastern cultures seamlessly intertwine. Burdened with the sudden recollection of his past life, he comes to a chilling realization: in the future, his younger brother Regulus is destined to kill him during a bitter struggle for succession. Armed with nothing but the memories and practical knowledge from his previous existence, Ageha faces a grim fate that most would desperately try to avoid. Yet, rather than plotting against the child who will one day end his life, Ageha makes an unexpected choice. Captivated by his sibling's charm, he decides to wholeheartedly raise the boy, viewing him as an adorable, fragile chick in need of protection. Channeling every domestic skill and specialized talent retained from his former life, Ageha handcrafts educational toys and even develops comforting dishes like steamed egg custard to nurture his young brother. His devotion extends far beyond their household, as he applies his modern expertise to revitalize and develop the impoverished lands surrounding them, determined to forge a brighter future for them both.