Idk how similar this is bc never read that but in this one he gains levels from the monsters/people he kills(if i remember correctly, he gets some of the monsters abilities too).
http://www.mangago.zone/read-manga/fff_class_trashero
I’ve been putting this one off so thank you for letting me know cause im gonna read it immediately
Try solo leveling, nano machine or the beginning after the end
Thank you!!
Are there any mangas similar to Arifureta where he ate the monsters and got abilities from that?