Fly Milk delivers milk in Penguin Village. There are three members in the gang: the leader, a member who looks like Tori-bot, and a short member who looks like the boss. Arale Norimaki and Gatchan briefly join the gang. They leave after witnessing that the Fly Milk are not that bad, confronting their rivals, the Mosquito Milk, by playing at several different games instead of actually fighting.
The gang briefly appears in "Penguin Village Dom-Dom-Dom!", and the boss is seen among the Penguin Village residents running after Arale and Gatchan.