Now that he has Niche and her pet Steak to watch his back against attacks by the giant insects known as Gaichuu, Lag Seeing's job as a Letter Bee should be getting easier.  But something's clearly not right in the land of perpetual twilight, and instead every new delivery they undertake seems to involve new complications and introduce even greater dangers to Lag's already lethal profession.  Meanwhile, Lag's search for his mentor Gauche seems to be going in circles, but when a sinister researcher known as the Corpse Doctor kidnaps Steak with the intent of dissecting him, a new series of revelations sends Lag and Niche in an entirely new direction.  Saving Steak from the butcher's knife, stamping the ambitions of a rival organization of letter carriers and escalating waves of Gaichuu attacks are only the beginning of the action as everything goes postal in LETTER BEE - COLLECTION 2!