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The setting of Sakasama no Patema really reminded me of the world in Pale Cocoon. Both settings involve a dystopic future where certain parts of the world are simply off-limits and considered too dangerous to enter. And in both, the protagonists are tempted into exploring the unfamiliar by mysterious pictures of blue sky and green land, drawing new conclusions about their worlds of origin.
The beautiful, strange, sci-fi apocalyptic world with a side of young telegenic characters exploring it... well, that could describe either of these works by Yoshiura. If you enjoyed his first feature film Patema Inverted, try Pale Cocoon, the short that made his name - or vice versa!