You can find 5 coins in the grass on the beach. Then you can enter the hot spring.
I did that and now I'm softlocked, because you have to find 5 more coins somehow, so I'm just going to cheat, because your story content hinging on stupid shit like that is inexcusable. I shouldn't have to go back, spam through unskippable dialogue with meanings lost in translation, and interact with every single tile available to me in order to get the next scene.
You can look for money, for example, on the beach or in a diner. In fact, you can collect more than 100 regular coins and 10-12 royal coins in the game.
This is not "stupid shit", but you need to play as intended by the developer. If you just want to watch pictures, then why play an RPG? Have you played the FF series for example, etc.? Guys, I really don’t understand, you don’t need dialogues, secrets, etc. (as in any normal game) are also not needed, the rules of the game are also not needed, what do you need? Does the character walk from left to right and look at animations/images? There are a lot of such games here. Let's be honest, is the game bad? I don't think. But a person comes and... gives a rating of 1, explaining that “Futa ruins everything.” Beautiful graphics, good dialogues, interesting story, mechanics, etc. But "Futa ruins everything." Other people really want Futa in the game. There is no need to say what should be and what should not be. It's just a game. There are no impassable moments, but if you prefer to play someone else's game according to your own rules (without reading dialogues, without reading the rules, etc.) then you should not be surprised at the result.
For example, to get to the baths you need to look for coins in locations, is this really strange for an RPG? I always write "Save often! Explore every location with EVERY CHARACTER!" Why control each character if this does not change the interaction with the outside world? If you don't like the rules, just find another game.
Edit, if you talk to the main character from the side, your game locks, you have to speak to his face.
This is a known (and so far only) bug and will be fixed soon, but the game is playable to the end.