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

In a world where Western and Asian cultures mix together, the only son of Count Kikunoi from the Kiryuu Empire, is Ageha. His life was already over at the age of 5. He, who was born in a corner of the country, has zero allies or useful skills in addition to being overweight. What's more, it seems that his brother Regulus, who suddenly appeared on his life and was presented for the Count as his bro...