So based on the two screens above, it looks like quite a bit of the game UI is in English?
Turn options in english: Fight / Defend / Skill / Item Etc.
also words like 'repeat' and 'log'.
On the inventory status screen, it looks like Stats are in english (str/ing/agi/etc) as well as some key facts about weapons (range, hand, etc).
Then stats themselves are numbers, so easy.
Based on those screens, it looks like the only thing I'd have issue with would be inventory item names, comments, and I suppose in game dialog?
If I don't care about the story translation, how hard would it be to play this game as an English speaker with little/no time to devote to learning a new language? Is it feasible? Again, I only care about experiencing the DRPG itself and combat mechanics, the story I can make up for myself if need be.