In the bustling streets of Ikebukuro, a masked killer strikes terror, sparing only Madoka Murasaki. The memory of his chilling gaze etches deep in her mind. Known as 'M' and imprisoned, this murderer's specter torments witnesses. As a fresh wave of murders emerges, Madoka grasps the chilling truth: M's malevolent game is far from over, plunging society into a sinister and enigmatic purge.