https://vndb.org/c69588
You can always go for the dragoness. She's probably the most selfless woman of all as she likes him even without that pitiful excuse of squeezing his sperm for gaining strength. She is blunt, clingy, simple, doesn't uses protagonist as a mere tool for gaining more energy, unlike other heroines. She likes him just the way he is, whether he has any specialty or not. That feels more natural and not forced and repetitive like in vampire/yuki onna and oni route. There is no pointless melodramatic emotional baggage in her route + she's fun to be with. The Protagonist doesn't have to pretend being "always a nice guy" around her, and thus can honestly express himself.
Regardless of human or non human heroine, in the end, their traits makes them most unique. You can choose either sly, manipulative, over-controlling ones or, the free-spirited, easygoing one. Of course, for those who aim for a harem route even in Nakige, "i want 'em all", is sort of an unavoidable regret. However, this game in particular gives much more satisfaction in individual routes, as its not porn without plot, or without negative after feelings (cheating yuki onna heroines, the protagonist being used, abused and subjected to forced memory loss etc).