Nemesis Detective Agency employs two detectives: Anna, the reckless genius, and Kazama, the self-proclaimed genius who is actually quite incompetent.

The story is set 2 years after the drama series. There is a serial murder cases about Anna and Kazuma’s friends are killed one by one. And it ends up with Kazuma kills Anna...! Will they be able to solve this intricate labyrinth mystery, even though the only absolute answer is despair?