[spoiler]The last episode was a sad one because Light died, he was killed by Ryuk (remember when ryuk said to light that the human who first uses the death note shall have a miserable life after? yeah that's it). Melo sacrificed himself just to help Ryuzaki L and Near to prove that Light is really Kira. Mikami was caught offguard with his negligence to the notebook, that made Light proven guilty. Tsk3. [/spoiler] My spoils aren't that accurate, correct me if i'm wrong pls.