Tegami Bachi (テガミバチ LETTER BEE, Tegamibachi; lit. "Letter-Bee") is a shōnen manga series by Hiroyuki Asada. The series was first serialized in Monthly Shōnen Jump for ten chapters, and is currently serialized in the new monthly magazine Jump SQ. After the Monthly Shōnen Jump was ended by Shueisha in June 2007. Tegami Bachi was adapted into two separate anime television series', entitled Tegami Bachi and Tegami Bachi REVERSE respectively.
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 Gaichuu, who attempt to feed of the "heart" that reside within these letters and packages.