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Both are BL/yaoi manga that take place in a fantasy setting. While they have different plots, both involve the main character going on a quest of sorts and gaining traveling companions along the way. Both are light-hearted and funny at times, but they also have their serious moments (though Crimson Spell is somewhat more serious than Tale of the Waning Moon, in my opinion). If you like fantasy and yaoi, then you should check out both!