Gals' fighters was on my to buy list, but when I went to check it in the eshop, it was suspiciously missing. Barring a few comments expressing their confusion on the title's disappearance, I couldn't find anything. Why would a game be removed from eshop?
GoNintendo mentions how it only seems to have been taken down from the European eShop.
We had a look on the UK eShop and can confirm the game is no longer listed. The good news is it's still available in North America. At this point in time, it's unknown if it's a temporary removal or permanent. Admittedly, it was a bit of a surprise when we heard the game had got a standalone release on the Switch eShop.
If we hear anything else - we'll let you know. In the meantime, if you want to experience this small slice of retro goodness, you might want to download this game while you still can.