Original. Think of all the singers with bad Engrish out there and imagine a song in English. I can't even listen to Koda Kumi's 1000 no Kotoba (1000 Words, I guess) in English without shuddering. It's not bad when sung by someone else in English, with different words, but then it's not really a translated version. Even BoA's music sounds much better in Japanese or Korean than in English.