Lag Seeing, the main character, works as a "Letter Bee" for the "Bee Hive" courier company. Amber Ground, where he is stationed, is shrouded in never-ending darkness except for an artificial sun that illuminates parts of the area. Accompanied by his loyal partner Niche and her companion, the creature known as Steak, Lag bears the crucial duty of transporting goods which contain the sentimental value of the inhabitants of Amber Ground.