 If you liked
Houkago no Pleiades
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 ...then you might like
Binan Koukou Chikyuu Bouei-bu LOVE!
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"Cute High Earth Defense Club LOVE!" / "Binan Koukou Chikyuu Bouei-bu LOVE!" and "Wish Upon the Pleiades" / "Houkago no Pleiades" are shows involving a cute alien creature giving five humans special abilities in order to achieve something.
The two series are both centred around a slice-of-life setting with an antagonist that is very obviously a friend of the protagonist.