So a bit of backstory on Witch Spring as a franchise before diving into this one. The story, while self-contained, is taking place around the same time as Witch Spring 1 and 2, and to a small degree, they do intersect. You don't have to have played the other games, which are only on Mobile, to follow the story here, but there are a couple of fairly big things that seem to resolve off-screen. Having not played the other games myself though, I do still feel you get the full story relating to Eirudy, so you are fine jumping in here if you don't wish to play mobile games.
Eirudy is a witch who lives alone in the forest, and wants to create a doll that can talk, and as she tries to discover a way to do this she stumbles across a human named Aldi. The story from there is pretty simple, you learn about witches being hunted by the church, and the focus is on Eirudy's ever-growing desire to connect with people. All the characters are fairly simple and basic, but at the same time very likable. Eirudy has a very flat and earnest response to pretty much everything, and the game does well to make it both charming and funny depending on what the situation calls for. It's a very good example of making the most out of some very simple cliques. It's a largely light-hearted story with it's share of fairly dark moments, and I appreciate the game doesn't always go for a cop-out everything is going to be okay kind of thing. Some horrible things were done, and consequences happen as a result.
The gameplay is turn-based with some interesting aspects. You just play as Eirudy, but with each turn, you can summon one doll, up to three in total. Mounts grant you passive stat buffs and effects, while others will take action alongside you. The gameplay is largely enjoyable, though once you realize the value of certain stats over others, it's really easy to break the game. Don't get me wrong, the gameplay is fun, but it's can start to feel like a bit of a slog.
The other thing is how you level yourself and the dolls. You level by training, and you can train after doing so many things in the game like battling or collecting items. That's not an issue, but Vitality to level up dolls can be a chore. You get vitality by defeating enemies and filling your soul crystal, and you use that Vitality to strengthen your dolls. You have a limit on Vitality based on your soul crystal, and given the lack of variety, especially in early games, you are going to be repeating the same process a lot early if you want to wake up and strengthen your dolls. The process can be fun at first, but the repetition can start to wear on you pretty quickly.
I ended up on the 'Truth' ending route my first run, and I like how you have to get that route a lot more than most games would do. I won't spoil it, but it fits the themes of seeing Eirudy grow into a person with a variety of emotions and experiences, it's not just simply picking the good or bad options. Though while I like this more than others, and the game is short enough that a replay for more endings isn't going to be a chore like some other games, it's really hard to say the game is good enough to play through again, at least not shortly after the first play-through. The problems mentioned with repetition above really don't leave me wanting to pick it up a second time.
That said, I enjoyed playing through this one. It was charming, with some flawed but fun mechanics, and the game looks good throughout. I had a good laugh a good number of times throughout as well. I don't think I'll go back and play the first two, as I hate playing anything on Mobile, but it's good enough that if the fourth one does get a US release I'll check it out. Just go in expecting a fun ride, and it's worth playing for most RPG fans.