Death Note, tom 12: Koniec

The ending felt so unexpected but also fitting. Did the author intend to challenge readers' ideas about justice and morality in this way?

The characters' choices became more morally gray than before, which made me question what I would do in their situation. How do others interpret their decisions?

The pacing kept me on the edge of my seat, but I wonder if the author planned this intense culmination from the start or if it evolved during the writing process.