The art is great, from the character to the backgrounds.
About the gameplay, I know it is a demo but I think it is fair to drop this just in case, it goes kinda too fast, and perhaps it could have some more options, like when it comes to the part where you automatically say you will stay and help Josuke out to clean the mess, that could easily be an option.
Also, it may be good to have a little bit more differentiated the actions from the thoughts.
Overall I am frigging loving this project, it feels amazing, "warm and fuzzy" as someone else already said in the comments.
I donated both to download the demo as well as I am a Patreon, so you go guys! 100% support from me!
Love you for doing something this cool <3