So... is Kekkon suru tte, Hontou desu ka finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: December 19, 2024
Manga finished: June 12, 2023
... But MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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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Synopsis
Takuya and Rika are two introverted coworkers at a travel agency who deeply value their single, peaceful lives.
Their comfort is threatened when their company announces plans to open a branch in Alaska and transfer a single employee there.
Facing the potential disruption to their lives, Takuya and Rika, who barely know each other, unexpectedly meet and bond over their shared predicament.
In a surprising turn of events, Rika proposes a fake engagement for one year to avoid being transferred.
Takuya agrees, and the two embark on a charade that may profoundly alter their cherished lifestyles in unexpected ways.