Blue Morphos was a su*cide instigating game that shook the foundations of Japan and claimed the lives of over one-hundred and fifty people. The instigator, it transpired, was Kei Yosuga – a universally loved high-school girl. How did she – a girl who was supposed to good – become such a monster? Miyamine, her childhood friend, begins to recall the very first mu*der that sealed their fates. “If the world doesn’t forgive you, I’ll be on your side.” What is this personal hell, where he sees her changing but cannot stop loving her?