Help me remember an anime?

It definitely aired within the last 2-3 years. In episode 1, there was some television sequence that shows a bit of Earth's history. It's about this boy who lives by himself at first, and several times a day, he's given 2 choices for how he should proceed, and he has to choose 1. At the end of the first episode, I'm pretty sure some weird girl falls from the sky, and she claims she has come to save him. There was also this scene in a children's park where he finds an adult magazine on the ground. Any idea what this anime is?

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