Manga Hachinan Tte, Sore Wa Nai Deshou!

Ichinomiya Shingo has the usual problems and worries of a 25-year-old single man. He thinks about the hard working day that lies ahead of him tomorrow. On this depressing wave, he falls asleep to wake up in a place completely unknown to him. Over time, he realizes that he is locked in the body of a six-year-old boy, moreover, he completely controls it.
But he received some feedback as well, so he, for example, found out that he was living in an impoverished family of nobles. He suffered from a significant problem - he did not know how to manage the vast territories that belong to him and his family. But in a difficult situation, his magic skill helps him. However, circumstances developed in such a way that his talent brought him more problems than well-being. Well, this is how his path begins in this harsh new world.