So... is Oyayubi Hime Monogatari 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
Oyayubi Hime Monogatari tells the story of Mia, a spoiled young girl who finds herself unexpectedly transported into the world of the fairy tale Thumbelina after reading the book.
Now miniature-sized, Mia must navigate this strange and often dangerous new environment.
Her main goal is to find a way back home and return to her normal size.
Along the way, she encounters various characters, both helpful and threatening, forming friendships and learning valuable life lessons as she journeys through the Thumbelina world.
Mia's adventure to return home and back to normal size is just the start of her epic story.