4. Oyako Club
(1818 Episodes)
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Oyako Club, or “Parent and Child Club”, is a family sitcom that aired in Japan from 1994 to 2013. With almost 20 years worth of consistent output, it’s unsurprising that this is one of the longest anime ever.
It’s 1818 episodes long and it centers around the relationships between family members. It’s a pretty wholesome sitcom with family-friendly content, which is most likely why it lasted for so long.
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