Steam has Danganronpa, and I am poised to buy a copy. My only niggling doubt is whether or not the game would be available through GOG. Anyone happen to have insight on the matter?

I sent an email to Spike Chunsoft but never got a response. They happened to be the company that handled the Japanese language version of Witcher 3, so there's existing contacts between CDPR and them (even if CDPR and GOG are not exactly the same thing). In the best case, it'll come some time later after the initial DRM'd period like Ghostlight's games (something I consider as a DRM-free tax of sorts). Worst case, Spike Chunsoft is totally uninterested in a DRM-free version whatsoever.

Japanese-released games aren't DRM-free friendly.

Just buy it, either the dev/publisher was pro-DRM or GOG arbitrarily decided no one outside Japan buys Japanese games.

Vote:

Danganronpa: Trigger Happy Havoc
Danganronpa 2: Goodbye Despair