I was really impressed with this demo overall! First of all, the aesthetic is really fantastic, and I love the premise and the setting. The red/black theme for the game sets the eerie, supernatural tone well, and I really like the gradients that are used for the "yominokuni" backgrounds.
The game is very polished and looks and plays well. All elements of the GUI are detailed and look FANTASTIC, from the start menu to the save/load screen to the log to the texting portions. The sprite movement is very dynamic, and I love the use of the diagonal/vertical panels to provide even more variation to the sprites. The sprite art is colorful and adorable. The custom soundtrack is wonderful, and I also enjoyed the point and click investigation (even though getting the last few items was a bit tricky!) The glossary was something that I haven't seen in many visual novels, and I really enjoyed collecting all of the entries!
All of the love interests are characterized well, and I love the diversity in their personalities and their different dynamics with each other. Rei was definitely my favorite, as I love his style, his reliable leader/big brother attitude, and his occasional moments of sincere awkwardness with the MC. My favorite scene was Rei's interaction with the MC before asking for what assignment she chose, as it really showed off his sincerity and his kind nature. However, all of the characters were intriguing, from the bubbly Emi to the taciturn Mayumi to the aloof Hiro to the gruff Ryuji. The character that I'm the second most interested by is definitely Haru. Although I enjoy childhood friends by default, I'm also curious as to the reasons behind his change in attitude towards the MC.
While I'm not 100% sure where the plot is going from here, I'm intrigued by the worldbuilding, and I think there's a lot of ways the story could go. I'm interested to see how it all pans out!
Overall, this game came out VERY well, incredibly polished! Great job to all the people who worked on it!