Tegami Bachi (Volume 1-20 is the latest issue)

Publisher: Shueisha
Author: Hiroyuki Asada
Size: 112mm x 174mm
Number of books: 20
Language: Japanese
Category: Shonen manga, manga
Latest publication date: 2016-01-04

Synopsis:
A land named AG (Amber Ground) with no dawn. There was a job to deliver people's Tegami on dangerous lands that could not reach the artificial sunlight illuminating the capital. People called Tegami Bees, who carried their "heart", which was entrusted to Tegami in betting on life!