Momo and Komomo are capable of delivering mail from any sender to any recipient, no matter the destination—across the globe, throughout the galaxy, or anywhere in the universe. Their routes take them beneath the sea, high among the clouds, just around the corner, and even across time itself, whether to the past, the present, or the future. Both work without rest to ensure that people’s most important letters reach their intended marks, while Komomo additionally devotes her energy to keeping the easily distracted Momo focused on the task at hand.