Hello, this might be a little weird but I have this vague memory of an old anime series that I used to watch when I was very young. I don’t remember any of the names of characters nor the series, all that I remember is that the 2 main characters were a demon or beast boy with a girl. They lived in this like feudal japan city that would get invaded by beasts or demons and then it was up to these 2 to kill it. I also remember the boy transforming into an adult version of himself and killing the demons or beast. I think to transform he ate something or after the fight he ate something from the demon but the memory is a bit hazy. The only other detail that I remember is that I think the boy had red hair or wore red. Like I said it was pretty old and the series in itself was very samey from the different episodes that I remember.
If anyone actually finds this then I would be really shook because google couldn’t give me anything.
Edit: Some legend in the comments found it for me and if u guys are curious it’s called zenki. Thank u all for the help and recommendations!
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