So... is PostPet Momobin finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
PostPet Momobin follows the everyday adventures of Momo and Komomo, two dedicated mail carriers.
Their unique job involves delivering letters across vast distances and even through time itself, ensuring that important messages reach their intended recipients no matter the obstacles.
While Momo focuses on the deliveries, Komomo takes on the additional responsibility of keeping Momo focused and preventing distractions, adding a comedic dynamic to their important mission.