Ichinomiya Shingo, a young 25 years old, single, company worker, while thinking of tomorrow’s busy working day goes to sleep. However, the when he wakes up, it was a room unknown to him. He learns that he is inside a 6 years-old boy and has taken over his mind. Furthermore, he learns a lot from the memories of said boy: he was born as the youngest child (8th son and 10th child) of a poor noble family living in the…