Although I didn’t mention it at the time, the local release of ef: a tale of memories is missing one of the textless openings, the final version with the Japanese verses of Euphoric Field.

aniroku (who I know nothing about) has put it up on YouTube with split screens comparing the footage from two versions.  Have a look and you’ll see why I’m glad to have found this (pay careful attention to the bottom screen from about 0:55).