Strange but interesting. There is no end to the story, however it doesn't end with a cliff hanger or anything. I think Haruto & the being known as Noah will continue learning from each other. The author discontinued this story once before so I don't know if it was ever suppose to have a final ending with no loose ends. However, I can see them contining on together.
Post-apocalypse earth when after Earth lost its battle with the invading enemy. We meet a wounded tired soldier and what seems to be his old friend! The problem with this one is that the story was shelved by the mangaka. So it is not complete. It is a shame because it was very engaging!