 If you liked
Alien 9
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 ...then you might like
Narutaru: Mukuro Naru Hoshi Tama Taru Ko
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Both start out very childish and cute, but are later incredbly dark, gross, disturbing, and odd. Also both involve strange creatures (and them fighting), school and home life, and both disect their characters. Shadow Star is easily the stronger of the two, but don't brush Alien Nine off, as it is also very good (and a little confusing).
Both stories are centered around young girls with a story that starts somewhat innocent and quickly turns dark and grim. They both have somewhat cutesy artstyle but don't let that trick you, because some pages become real grotesque real quick. Both stories are also centered around and alien type of enemy.