@Terabyte I figured they were different due to reading the descriptions. But wasn't 100% sure because some Manga/Anime gets a revamp and the whole series starts again.
Though, I agree. Doing something more to help others know it's a continuation of the series would help, IDK what they could do though. Maybe a disclaimer at the top, right after the title? saying something like
"Disclamer: No mistake on seeing Vol. 1-5 twice. After the First 1-5 volumes, the second set is under the new title "Demon Lord: Retry R", and is the continuation of the series."
Thats about the only thing I can think of, cause some people might not read the descriptions of the Volume they buy, or miss rhe giant "R" next to Demon Lord:Retry (I did lol). Then just think the second 1-5 are just a remastered version of the older ones.