 If you liked
Kaminaki Sekai no Kamisama Katsudou
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 ...then you might like
Kimi no Koto ga Daidaidaidaidaisuki na 100-nin no Kanojo
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Hillarious parody shows of generic genres with plenty of well-placed fanservice and a more wholesome theme than you might expect.
Aruraru and Hakari could be twins.
As for the diffrence, KamiKatsu is a fantasy show with an intriguing plot while 100 Girlfriends is a harem/romance that focuses on characters and relationships.