>>717808091
Fragile Dreams. It's an obscure Wii game where you play as a lone boy in a post-apocalyptic world looking for other people. The controls are wonky and the graphics are average, but it's worth playing it for the plot and the Feels™ it gives you.
There's also a manga set after the events of the game: https://mangadex.org/title/e8a63cd0-2bcb-4c7d-bb8b-2b2932264853/fragile-sayonara-tsuki-no-haikyo