Yuusari Central, 13 Nocturne Way, Head Post Office Beehive is the 7th overall episode of Tegami Bachi
Lag's group is allowed to pass over Bifrost Bridge, and therefore, they reunite with Connor, who has been waiting for them. He rides them to Central Yuusari, where Lag will take his exams in the Head Post Office.
The sub-master, Aria Link, whom Lag recognizes in Gauche's thoughts, brings him to see the master, who turns out to be Largo Lloyd. Lag is directed to do his suitability interview exam with another initiate, McKay G.
They are to deliver letters to a town by going through a path where gaichuu are frequently encountered. McKay gets there first and encounters a centipede gaichuu, Gaichuu Glen Keith; however, he has no prior experience with gaichuu or firing a shindanjuu.
Lag's group soon arrives and defeats the gaichuu successfully with team coordination; however Lag ends up dirtying the letter. Zazie, the exam proctor, arrives to evaluate their performance. Using Lag's shindan on McKay's letter, it is revealed that McKay forged it when his was dirtied. McKay failed the exam while Lag was given Zazie's approval. Lag is surprised to learn from Zazie that Gauche is no longer a Letter Bee - to which, Connor was hiding all along. This brings grief to Lag.