 If you liked
IS: Infinite Stratos
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 ...then you might like
Mashiro-iro Symphony: The Color of Lovers
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This anime is also very similar to Mashiroiro Symphony: The Color of Lovers. The main character is the only guy in a Female School!!! The reason he joins is he is able to use a machine which only females can use. There is quite a bit of ecchi in this anime but it is in a contained anime. The harem that surrounds the main character is quite alike. You should probably watch the first episode & you will truly be astounded that's a gurantee if you loved/liked this anime