 If you liked
Masou Gakuen HxH
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 ...then you might like
Dokyuu Hentai HxEros
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both have that one guy to bunch of girls ration where they have the job to fight off other worldly beings whom were out to invade Earth.......and they power up using that "Ero" energy thing.
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Recommended by JiangHaoyi1979
Same thing but with mechas (mecha suits) instead of magic
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Recommended by TimothyCalalo