Books like A Certain Magical Index, Vol. 11

Now that the Daihasei Festival has ended, life returns to normal for the boy who knows nothing but misfortune, Touma Kamjiou. But in a stroke of unbelievably good luck, Kamijou manages to snag two tickets for a getaway overseas trip! He and the sister, Index, make their way to pearl of the Adriatic, Venezia, where maybe the two will even have romantic rendezvous and many heart throbbing events. But is everything really going Kamijou's way, or is there something more to this too-good-to-be-true adventure...