 If you liked
Ichiban Ushiro no Daimaou
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 ...then you might like
Hyakka Ryouran: Samurai Girls
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They share plot, 2 sides fighting eachother, but in the last battle, they figh together, they charaters are very similair. Watching samurai girls made me feel like watching ichiban in a samurai style. Both have are harem, action and ecchi, ichiban is more of magic, samurai girls is more of swordplay. If you like 1 of them, you must watch the other.