English not supported. Perhaps sometime in the future the dev can start with an English Interface translation (Easiest and least expensive). If a fan base develops and increases, perhaps English Subtitles can be added (Most difficult and most expensive). See my explanation about translation.
06/25/24 - Update: Don't want to wait for a proper English Translation of a non-English supported game but want to play the game now? You can try to use the freeware "LunaTranslator" combination text hooker (text grabber) and language translator application (GitHub page | Download page) to machine translate or AI translate the game's native text into English (Note: Machine translation is 1:1, word for word translation. Some ideas may get "lost in the translation". AI translation attempts to mimic a natural speaker's translation of a language into English (I haven't tried this method yet)). See the verbose "How to" demo video posted by "Daiya" on YouTube (Note: From her dialogue in the video, Daiya seems to be a teenage girl, so try to bear with the "quirkiness" of her dialogue with the viewer [you]. She set LunaTranslator to use AI translation [See the improved English translated, purple text in the screenshot]). In the past, I personally have used the AGTH (Anime Games Text Hooker application with the Atlas Japanese-English translator application) to try to play untranslated Japanese H-games with machine translation and just discovered this combination text hooker and translator application that supports AI translation (An improvement over machine translation) so, if you have any in-depth questions then it's best to visit the dev, "HIllya51"'s Q&A page on GitHub.
06/25/24 - Update:
Don't want to wait for a proper English Translation of a non-English supported game but want to play the game now?
See the verbose "How to" demo video posted by "Daiya" on YouTube (Note: From her dialogue in the video, Daiya seems to be a teenage girl, so try to bear with the "quirkiness" of her dialogue with the viewer [you]. She set LunaTranslator to use AI translation [See the improved English translated, purple text in the screenshot]).
In the past, I personally have used the AGTH (Anime Games Text Hooker application with the Atlas Japanese-English translator application) to try to play untranslated Japanese H-games with machine translation and just discovered this combination text hooker and translator application that supports AI translation (An improvement over machine translation) so, if you have any in-depth questions then it's best to visit the dev, "HIllya51"'s Q&A page on GitHub.