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

白豚貴族ですが前世の記憶が生えたのでひよこな弟育てます＠COMIC

Houchou is the only son of Count Kikunoi from Kiryuu Empire. Despite being born in a remote area with no allies or useful skills, he was overweight. His brother Regulus appeared suddenly in his life and was presented as his brother by the Count. However, Regulus had plans to kill Houchou for his right to succeed as Count. Houchou's only weapons were his skills in cooking and sewing, which he acquired along with memories from his previous life as a Japanese sprouted from Kiryuu Empire. Despite his difficult circumstances, Houchou raised his younger brother and enjoyed making educational toys for him while also preparing delicious chawanmushi (steamed egg custard). With his previous life's skills and his role as a housekeeper, Houchou improved the lives of people in his territory, taking small steps towards leading them to a better future for himself and his country.