I'm looking for a manga where it is in the japanese historical setting with a teen monk that is very good at solving riddles. I think a riddle demon is following him around and always throwing random riddles at him, so that he can take his soul.

If you need more details than this, let me know!
Thanks 🙂

Sorry, not an answer but I'm really interested in the story too. I hope some one knows it.

Kikai-Banashi Hanasaka Ikkyuu is perhaps the manga you're looking for? I have not read it myself but it definitely sounds similar to your description.

Yes! Thank you very much!! 😀