Houshin Engi by Fujisaki Ryuu, 23/23 volumes, complete, ENG scans by SnoopyCool
One of my favourite shounen (Jump) series ever. There's official VIZ version but I think SnoopyCool's fan scanlations should be available as well. As this is early-2000s, this is based on old tankoubon volumes, not the later 18 volumes long bunko edition, nor even later 12 volumes long kanzen edition.
Story was also made into two different anime, Senkaiden Houshin Engi (26 eps, also known as 'Soul Hunter') and Hakyuu Houshin Engi (23+1 eps). Senkaiden diverged after volume 15 and Hakyuu is sadly very rushed, but at least tries to adapt the whole manga.
Nevertheless, enjoy and mata ai-muscle!