Honestly, that ending left me reeling for a solid week. After all that brutal journey through the torn cityscapes, 'Shangri-La' doesn't give you a clean victory. The protagonist, Kuniko, succeeds in her mission to protect Atami and connect with the Kariba, but the cost is staggering. Her closest friend, Miiko, sacrifices herself to become the new Kariba, essentially merging with the monstrous system to control it. The final image is Kuniko, now a leader, looking out at a fragile peace with this immense, living creature that contains her friend's consciousness. It's not a happy ending; it's a bitter, complicated truce. The meaning, I think, is deeply anti-war and ecological. True peace isn't about destroying the enemy but integrating with and understanding the 'other,' even if that integration is a form of perpetual, personal loss. The 'Shangri-La' they achieve isn't a paradise, but a responsible, painful coexistence.
Kuniko doesn't get to retire. She has to govern this new world, forever linked to and mourning her friend. That melancholy responsibility is the core of it. The series argues that rebuilding after collapse means carrying the ghosts of your choices with you, every single day.