 If you liked
Houkago no Pleiades (TV)
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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.
Basically if you love animes where the protagonists do a lengthy transformation sequence every episode then these are for you. the premise is also very similar; they need to transform into magical girls/boys in order to help an alien.
only difference being one is with girls and one is with boys. Both also take place in a high school setting.