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Amberground is locked in darkness. A man-made star casts only a dim light over the land.
The pitch-black wilderness is infested with Gaichuu - colossal insects with metal exoskeletons.
The Gaichuu make travel between the cities of Amberground extremely dangerous.
But thankfully the Letter Bees, a brave corps of messengers, risk their lives in order to keep the hearts of Amberground connected.
As Bees and ex-Bees alike gather in Yuusari, the rampage of the unstoppable Gaichuu Cabernet continues - and heart attacks only seem to make it more powerful.
As it absorbs the attacks, Cabernet keeps morphing into stranger and more sinister forms.
Meanwhile, a tragic accident triggers a different kind of transformation in Niche...