The 8th Son? Are You Kidding Me?

Shingo Ichinomiya was a young and single salaryman. One day he falls asleep to find out that he now lives in another world in the body of a 5-year-old boy. He is a part of a poor family, which has many kids, with him being the youngest son, which makes any hopes for a bright future for him near impossible. However, Shingo has an aptitude to a magic. Will it help him to succeed in the new harsh world he lives in now?