Nashiro Nibi: Pain tolerance

Nashiro Nibi a unusual name for an american kid, while Nashiro might be 15, but his mind is that of an adult with pain that would last a life time. Nashiro was orphaned at a young age because of his parents deaths, which was at the hands of his grandfather, with his parents dead he finds a lost item that will change his life. Anyways Nashiro will continue with his life as he takes the pain that will be thrown his way, and he won't give up until his grandfather's blood runs down his blade.