Isekai Ryouchi Kaikaku: Tsuchi Mahou de Hajimeru Koukyoujigyou

Michio Tsuchida, a 35-year-old single man. One winter, while returning from the office, he got stabbed by a kitchen knife in the process of saving a girl. The pain of stabbing spread throughout his body, making him lose his senses. The next time he opened his eyes, he found himself as the fourth son of a viscount in another world. The story is about a reincarnated boy who enjoys his new life while using his past knowledge to reform his territory. Source: NU