A mysterious couple serial murder case. The only clue left at the scene was an injection mark on the neck. Despite desperate investigations, the case seemed to hit a dead end. Amidst this, investigator Shoko relied on her instincts to uncover the truth behind the case. She was just about to reveal the mastermind... but then, an order to halt the investigation was issued at the last moment. Something was going on behind the scenes... In order to get to the core of it, Shoko stood up alone, but danger loomed over her.
