The concept is 10/10 would love to see this is as a full game! The controls of walking around feel nice too and the camera angle feels perfect! The art is great! I love the portrait art it reminds me "Cells at Work" a little bit and the 2D/3D art mix is something that gets me everytime.
The dialogue is funny and has that nice slice of life anime feel to it; would love to see more of it.
The card game imagined was pretty fun; but I'm sure the real card game will be more fun! Honestly I enjoyed the funny inserts between scenes as much as I probably would've the actual gameplay. It was well done and I think definitely better than just empty slates. Plus probably a lot easier to know what needs to go there later on if you guys work on it more.
You guys have a seriously cool proof of concept though and I hope to see more from it!