Notch - The Innocent LunA: Eclipsed SinnerS

The third title in the Notch Series, although it is a standalone story. A faraway island that has been forgotten by the rest of the world for decades had itself turned upside down, and peaceful life on it came to and end because of a series of brutal murders that had happened, getting even the protagonist, Asakawa Yuhito's childhood sweetheart killed. Can he find the real killer, and the deep dark secret behind the most powerful two families which governed the small island for times since immemorial?