 If you liked
Bishoujo Senshi Sailor Moon
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 ...then you might like
Kingyo Chuuihou!
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A lot of the crew that would go on to define the 90s Sailor Moon anime first worked on Goldfish Warning. The Sailor Moon shares the most similarity in its first season, with lots of light hearted, cartoonish episodes. If you're looking for something with that SM s1 vibe, this is a great pick.