Letter Bee

is a shōnen manga series by Hiroyuki Asada. The series was first serialized in Monthly Shōnen Jump for 10 chapters then after the that magazine was ended by Shueisha in June 2007, it appeared in Weekly Shōnen Jump for 1 chapter, then was serialized in the new monthly magazine Jump SQ until November 4, 2015 and resulted in 20 tankōbon volumes. Letter Bee was adapted into two separate anime television series', entitled Letter Bee and Letter Bee REVERSE respectively.

Plot
The story takes place in the land of AmberGround, a place of perpetual night only partially illuminated by an artificial sun. Lag Seeing works as a "Letter Bee" (delivery boy) at the "Bee Hive" (a delivery service), with his Dingo, Niche, and her "pet", Steak, traveling with him. As a Letter Bee, Lag's job is entrusted to deliver letters and packages from town to town while avoiding Amberground's deadliest hazard — a species of giant armored insect known as Gaichū, who attempt to feed of the "heart" that reside within these letters and packages.