The Useless Prince Turns Out to Be a Genius Alchemist Screw the Throne, I’m Just Here to Pamper My Adorable Siblings

One day, a man who is passionate about warm, loving families finds himself reincarnated in the magical Iscalion Empire as Prince Asha, the rejected eldest son. However, he is considered too "tainted" by his lineage to be a candidate for the throne and has been kept apart from his younger brothers since their birth. Consequently, he relinquishes his ambitions for the crown, embraces his newfound freedom, and immerses himself in alchemy as his personal playground. With his extraordinary talent (and recollections of modern science), he inadvertently creates groundbreaking technology?! Even nobles find themselves overpowered by his "inventions." Before long, he unwittingly takes control of the imperial succession conflict. "All I ever wanted was to be called Big Brother' someday." A clever, genius big bro rises to power in the empire for the sake of his little brothers. Welcome to this heartwarming, extraordinary sibling fantasy!