By the time he opened his eyes, Kubota Tamotsu (34 years old) has been reincarnated into another world. Moreover, as a 6 years old slave with "Level 1 Barrier" skill. To surpass his limitations and become a powerful Barrier master Kubota begins a hellish training, full of obstacles and struggles. ___ [Original Web Novel](https://ncode.syosetu.com/n3631do/) [Light Novel](https://bookwalker.jp/series/130407/)