Those are JAPANESE publishers. It's a miracle that even the base game alone, will come DRM-Free.
Japan is the last place I found a boxed DRM free game I could buy though (which I did). If there is a miracle, it's that it's multi-lingual on release. Otherwise it's pretty natural for a japanese game to be DRM free, outside of consoles they're not the most literate in PC games (as proven yet again by the lack of keybinding in this game).
I know the kickstarter had collector tiers where you get sent a box, but I'm afraid it will not contain an actual copy of the game for the PC version.
So I have two concerns : no boxed release, or a box with a steam key.
I don't get it, GOG provides perfect offline installers, yet no one issues them for their retail releases (I'm mad forever against warhorse studios). Publishers are bonkers. Are there really steam drones getting their keys through retail?