One day, a man who longed for a close-knit family was reincarnated in the Iscarion Empire, where magic was highly developed. His name was Asha. The unfortunate first prince was never the eldest son because of his lineage, and was destined to be shunned by his beloved younger brothers. So he decided to hand over the throne to his second son and enjoy the freedom of his alchemy hobby. As he spent his days immersed in experiments... he suddenly made a great invention with his overflowing talent and scientific knowledge!? He also accidentally defeated a high-ranking nobleman and even dominated (?) the battle for the throne. "I'd like to be called Big Brother someday." A heartwarming brothers fantasy about a laid-back older brother who unconsciously takes control of the empire for his younger brother!