The episodes of the Tegami Bachi anime are an adaptation of the manga series by creator Hiroyuki Asada, currently serialized on the Japanese monthly Jump SQ. magazine. The story is about a boy named Lag Seeing, who is a "Letter Bee", a delivery boy at the "Bee Hive" which fulfills everyone's delivery requests. Lag's "Dingo", or personal bodyguard, keeps him out of danger from the Gaichuu, giant insects that roam the darkness and attacks anyone near them. The series explores Lag's adventures as he helps deliver packages for the inhabitants of AmberGround. The animation will be handled by Studio Pierrot, while the cast that voiced some of the characters featured in the Tegami Bachi special Tegami Bachi: Hikari to Ao no Gensō Yawa (テガミバチ 〜光と青の幻想夜話〜?, Letter Bee: Light and Blue Night Fantasy) will return for the regular anime.
The series premiered on TV Tokyo, TV Osaka, TV Aichi and their affiliated stations on October 3, 2009. A total of seven DVDs were released in January 2010 by Bandai Visual. The episodes have currently four pieces of theme music, two opening themes and two ending themes. The first opening theme Hajimari no Hi (はじまりの日 Day of Beginnings?) is sung by Suga Shikao featuring Japanese hip-hop DJ Mummy-D which appears in the first 13 episodes, while Love Letter no Kawari ni Konoshi o. (ラブレターのかわりにこの詩を。 This Poem In Place of the Love Letter.?) is sung by Seira, which serves as the second opening theme for episodes 14 onwards. The first ending theme Hatenaki Michi (果てなき道?, lit. Endless Road) is sung by HIMEKA which appear in the first 13 episodes, while Hikari no Kioku (光の記憶 Memories of the Light?) is sung by Japanese rock band Angelo, which serves as the second ending theme from episode 14 onwards.