Dorry the Giant launches an attack on Luffy and crew, assuming they are the ones who gave him exploding ale. He's defeated by the rubbery power of the Gum Gum Rocket, but there's still one question: Luffy didn't do it, so who slipped Dorry the ale?

"Amberground is locked in darkness. A man-made star casts only a dim light over the land. The pitch-black wilderness is infested with Gaichuu -- colossal insects with metal exoskeletons. The Gaichuu make travel between the cities of Amberground extremely dangerous. But thankfully the Letter Bees, a brave corps of messengers, risk their lives in order to keep the hearts of Amberground connected. Gauche Suede is on his last delivery before a big promotion....

"Lag almost breaks the record time on his Letter Bee test, securing a job as a letter bee! But his celebration ends with unwelcome news: the record holder, his hero Gauche Suede, is no longer a Letter Bee! Shocked, Lag seeks out Gauche's little sister Sylvette to learn exactly what happened. But Sylvette has no answers, only memories and a broken heart." -- Back cover.

"Lag, now a Letter Bee rookie, meets Dr. Thunderland, Jr., a peculiar man who collects and catalogs the various Amberground species. When the doctor takes a particular interest in Steak, Lag and Niche have to hustle to keep him off the doctor's dissection table! The ensuing chaos pays off for Lag when the doctor reveals that Gauche -- Lag's missing hero -- paid the doctor a visit before he disappeared." -- Back cover.

"Lag finds his long-lost hero Gauche Suede! But Gauche's heart is so depleted that he has no memory of his former self, and now goes by Noir the Marauder. Lag's only hope to recover the real Gauche is a special letter bullet that will convey Lag's heart to his friend. Lag's not sure how to go about writing the perfect letter, but his Letter Bee duties offer some good lessons in connecting hearts." -- Back cover.