I found this interesting and what I think is a rare set, at least I've never seen such a piece or something of similar. As the title states snakes is the going theme, and they are very animated. There is a lot going on here, even to the point that the seppa have snakes, overkill or a nice touch... My favorite fitting is the Kurikata, the way the tail wraps around and dangles in the air, it even seems to have a small sinister looking smile. Something also I'd like to point your attention to is the urushi, has actual snake skin worked into it, like a snake candy-cane. The tsuka has also snake skin instead of shark skin.
The Koshirae is enough to like the set but the blade is interesting, you'll notice plenty of Horimono that actually looks snake-ish... Nakago is mumei, any thoughts to the smith??? You don't need to look far to find the answer? Easy kantei