It is a bit ambiguous in this case.
All detected relations are finished, but we could not confirm the source content in MangaUpdates. Please check the release order section for a complete list of relations.
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Hanabi-chan wa Okuregachi centers around Musashi Shinonome, who inherits a pachinko hall from his grandfather. He discovers a girl named Hanabi, who claims to be a pachislot machine brought to life.
Hanabi isn't alone; she has two sisters, Versus and Thunder, who are also humanized pachislot machines.
The anime follows Musashi and the trio as they work together to revitalize the pachinko hall and make its grand reopening a success. It seems like a slice-of-life story with a focus on the unusual nature of the three girls and their connection to the world of pachinko.