I'm a librarian who loves anime, manga, and reading a wide variety of genres.
.... I don't know about this.
I guessed the killer fairly quickly because there were so few people who seemed capable of the murders, and I only briefly got distracted by a second possible suspect.
The mix of characters was nice, but there were too many of them for the total number of pages. The deaths didn't have the impact they should have.
And the last few pages... Huh. I should be happy for that character, I guess, but instead I feel kind of empty.