Amberground is locked in darkness.
After years of searching, Zazie is on the trail of the Gaichuu that devoured his parents\' hearts..
But thankfully the Letter Bees, a brave corps of messengers, risk their lives in order to keep the hearts of Amberground connected.
The Gaichuu make travel between the cities of Amberground extremely dangerous.
The pitch-black wilderness is infested with Gaichuu--colossal insects with metal exoskeletons.
A man-made star casts only a dim light over the land.
Amberground is locked in darkness