You were a transfer student at Yumenosaki Highschool. And strangely, you've got yourself involved in the... crimes happening around the school. You're in library, hiding behind one of the shelves as you hear a female student scream for help and what follows are sounds that is akin to stabbing a flesh. It's scary, and you wanted to go to help the student, but when you're about to go out of your hiding spot, someone stopped you by holding your wrist. It's Mika, your classmate. And the infamous Highschool Detective of Yumenosaki High