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I have the official kodansha version so I can tell people that this 2003-10 series is one of the best stories ever. Why? You'll have to find out for yourself
It's a dark fantasy series. If you like Tokyo Ghoul, Solo Leveling,
AoT (SNK) (;_;),
Ajin, Parasyte - you know where this is going; then this is definitely a gold series. It has sci-fi and supernatural elements to it
Action Sci-fi Shounen
Suicide Mature Themes
Alive - The Final Evolution