A few of us friends have created this list of all anime series with polygamy in them
We guys plan to keep updating list and create more content with different stuff if anyone want to contribute or just chill please message me here at myanimelist
you can find a more comprehensive list here: https://pickyouranime.com/polygamy/
Any suggestions for the list will also be appreciated
Note - Anime not have polygamy in them due to not completely covering their source material but their source material does have polygamy
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