Bleach System in World Bleach Bleach System

A sergeant dies in World War III he was orphaned and was adopted by an elderly couple who died as long as he was 16 so he went to be military to do the same as his father did when he was young before retiring from the military.
(he was 5 years old and was adopted he see animes, wuxias before going to be military)

I'm doing this fanfic for fun and my English is medium