If you liked
Shi ga Futari wo Wakatsu made
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...then you might like
Deadman Wonderland
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The stories are not similar but both have blood-filled fight scenes and some kind of supernatural element (even though Haruka is the only one on UDDUP). If you enjoy the realistic art of UDDUP then you should try Deadman Wonderland. Both of the series have a hint of romance but very little compared to the action.