A long time ago i read a shonen manga where a teenage boy turns into a monster. Those monsters kill humans, maybe eat them, too, i cant remember (the manga is NOT Tokyo Ghoul) but he tries to resist it. Some hunters start chasing after him but something happens and he convinces them that he can be good and not kill people. The last chapter I read he was doing some trials or something and there was a side character named Kaya, i think.

Sorry that I cant add any more info >n<

Kurozakuro maybe?

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Is this me in a nutshell?
Pretty much.

yes! thank you, ive been searching for this so long its a shame its discontinued, i remember i loved it