Do the devs have any plans on ever releasing an English version? I've checked their dlsite (with google translate) and it doesn't seem like they have anything to say about it. There doesn't seem to be anyone requesting a translation on this game either. A damn shame, I took the time to comprehend the Japs in some of the H scenes, and I think there is a lot of merit in playing or replaying the game in English.
But if you are interested in playing it in English using a machine translator, then I've got something you can use. The
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works pretty well with this game, as far as I've checked. Maybe some text will spill outside the box, especially in the upgrades screen, but most of the time it behaves itself pretty well. The way this tool stands out is the fact that you can edit the translation yourself, if you have the time and means. Best case scenario, one that have mastered the indecipherable language of Japanese, in their great benevolence would share with us a manual translation, for us non Japanese speaking mortals. But until (or if) the time comes, the machine translation should be enough.
The github page is a wall of text of programming mumbo jumbo, but all you need to do is follow the Installation chapter and you're good to go. Or, if you fancy translating the game yourself, then reading the Manual Translation chapter should helps you to get started. It should work with other Unity games too, but you won't know how well until you tried.