I've played the demo and oh my... I don't even know where to start...
Your game is incredible. I'm utterly stunned by it. I've never seen that kind of plot, or at least not with the main character being the one suffering that kind of problems - usually it would rather be a romanceable character, and the main character would have to help them, if doing their route. Seeing that kind of role reversal is delightful.
I've really enjoyed the writing style, and the music choices and art style complement it very well. The music conveys all the right emotions in a very subtle non-invasive way, and the character sprites are expressive and nice.
And the feels! It may be the first demo ever to genuinely bring me to the verge of tears, so I can't even imagine what it'll be in the full version! Ren is a great character, so unusual for a MC as I've already mentionned above, and I really like Haru and the three patrons so far too. The cute little brother is one thing, but you did a really good job in making the players attached to character you can't even actually see so far.
I really can't wait for the full version of this. You did an outstanding job and made me really happy with this game, even though the subject is very hard and heartbreaking. Thank you very much for creating this! And good luck with the full version of the project!