If you liked
High School DxD
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...then you might like
Shinmai Maou no Testament
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HS DXD story is a very close match to that of shinmai maou testament, red haired demon kings daughter with big (.)(.). and a hero that is slightly perverted. Although the Guy in HS DXD starts off a bit of a wimp and become strong, were as the main guy in shinmai maou no testament is already a bit of a bad ass. to sum it up. Habitual Ecchi that the most followed trend between these two anime and a harem of demons.
If you liked
No Game No Life
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...then you might like
Overlord
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To start in both of the anime, the main characters are OP and pretty much unbeatable in what they do. all though overlord is in the VRMMORPG genre and NO Game No Life being based in a non VR world were game are everything. If you like one you most likely will like the other.
If you liked
Black Lagoon
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...then you might like
Btooom!
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both have companionship that are born in war type settings were the male main like the girl main both have blood and gory scenes and tactics to pull off the perfect kill. black lagoon has a more Marfia vibe to it. and btoom! a beat the odds in a game vibe.
If you liked
IS: Infinite Stratos
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...then you might like
Aquarion Evol
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Similarity:both are based in schools were students fight in Mech to protect the world, both have romance and love triangles between the students in the schools. Differences: I.S is a more harem genre as the main character is the only male in the school were as Evol has a bit more monogamy. also I.S has the school participating in duels between country like a sport rather then war between worlds.