It's one hell of a game. Great mystery that blends in comedy and drama quite seamless. Date and Aiba are a great pair together to help you find clues....and Mizuki is a great character in itself.
The gameplay is like walking point and click game, and it's done with Aiba...who is your eye, lol. She can create an area where she can see what happened in a certain area or get clues, it makes for an interesting time. AI also has a whole bunch of branching paths that give you multiple endings, and one main ending after you do everything.
The biggest compliment is the writing itself, it's so cleverly written whether it's when you find out about certain plots in the story, and the hilarity that happens with Date...he's quite the strange character who's a bit...uh...lewd, lol. He has some of the funniest scenes I've seen in a game.
I have to recommend this to everyone, its an awesome story with large replayability with the branching paths and just an overall good time!