YOU SAID:

I will slay the beast if it's the last thing I do

INTO JAPANESE

それが私が最後のことなら、私は獣を殺すだろう

BACK INTO ENGLISH

If that's the last time I'll kill the beast

INTO JAPANESE

それが最後なら、私は獣を殺すだろう

BACK INTO ENGLISH

If it's the last time, I'll kill the beast

INTO JAPANESE

最後なら、私は獣を殺す

BACK INTO ENGLISH

If it's the last time, I'll kill the beast