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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Watashi to Watashi: Futari no Lotte tells the story of two girls, Luise and Lotte, who unexpectedly discover they are long-lost identical twins at summer camp.
Raised separately after their parents' divorce, they possess contrasting personalities: Luise is outgoing, while Lotte is more reserved.
Struck by their shared identity and the desire to know the parent they've been missing, they concoct a daring plan.
The girls decide to swap places, each intending to experience life with the other's parent and gain a deeper understanding of their family's past.
Their adventure explores themes of family, identity, and the challenges of navigating unfamiliar situations, as they each step into the other's shoes.