Doraemon Movie 42: Nobita to Sora no Utopia

Nobita hears of Paradapia, a perfect city in the sky where everyone lives happily and becomes an ideal version of themselves. Together with Doraemon, Shizuka, Gian, and Suneo, he sets out to find it using a new flying craft and reaches a place that appears to offer everything a person could wish for.

In Paradapia, they meet a robotic cat named Sonya and begin experiencing a life without ordinary problems, but Nobita senses something unnatural beneath the perfection. The closer the friends come to the city's secret, the more they discover that happiness without room for difference can become a cage. Saving themselves and Paradapia means defending the very imperfections that make each of them unique.