Lag Seeing, who was rescued at a young age by a national postal service worker known as a Letter Bee named Gauche Suede, idolized this Bee and finally met him again after he went missing. However he calls himself the Marauder Noir and steals the letter from Lag. Lag, injured, is saved by the Express Delivery Bee Jiggy Pepper and taken to the Bee Hive, but Lag's partner, his dingo Niche, doesn't take it very well...

A person spotted Noir up in the northern reaches of Yodaka. Lag is ordered by the Bee-Hive Master Largo Lloyd to find out what Noir is up to, and he heads there with Niche and Steak. There he discovers a shell of what looks like a giant gaichuu, as well as a used cartridge which Noir left behind. Lag shoots his own shindan into the cartridge!