Tegami Bachi: Letter Bee
Gauche Suede is about to make his final delivery before earning a promotion. While working in Yodaka, the bleakest region of Amberground, he discovers his package is actually a young boy named Lag Seeing. Lag is still shaken by his mother's disappearance and is being sent to live with his aunt. As they travel through the hazardous outskirts, teeming with deadly Gaichuu, the perilous trip leaves a lasting impression on Lag-one that drives him to pursue becoming a Letter Bee.
