A brief description of the manga The Adventure Of Boy With A Mind Of A Middle Aged Man:
Sagami Shirabe, a cunning middle-aged man, reincarnated himself in the body of a young boy with astounding abilities, but alas, living in a poor noble family with a cruel mother. Moreover, at the age of 13, they expelled him from their land… So now he is in a strange situation.
“Well, if so, how about we just explore this world?” – he thought.
With his magical powers and knowledge from a past life, he starts his adventure!