I messaged Chairi some questions and he replied.
I wrote to him in English and on the bottom, I sent him a Google Translated message. Chairi did the same, posting the english message on top and the japanese message on the bottom. I just included the English part.
Here it is for anyone interested:
Me:
Is this the final version of the game? Are there any more? If this game is purchased, will the updates be sold separately? Thank you very much. This is a really wonderful game.
Chairi:
Thank you for the message.
This game is effectively the final version.
Upcoming updates will be done free of charge.
On the story this game is part 1.
However, it will be many years ahead for part 2 to come out, and the system etc. will be significantly different. In other words, part 2 is a separate game.
Me:
Oh thank you so much for the response! Will this game come in English also? Will the update be in English? Also, how will we be able to know if there is an update to the game? Thank you! Amazing game!
Chairi:
Unfortunately this game is not yet English-ready.
I am currently working on Englishization work, but I think that completion will be several months away.
Conversations in the game are in Japanese, but there are map's destination display and image explanation etc. I think that advancing the game does not matter even if you can not read Japanese.
Although I have distributed the previous trial version up to now, people who can not read many Japanese already are playing.
The announcement of update will be done in my blog
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