Only in manga the world is so beautiful and pleasant after the apocalypse. In Western fiction, the usual post-apocalyptic setting is something like the world of Fallout -- deserts, radiation, monsters, bandit gangs fighting wars for fuel and territory, and all that sort of thing.
In manga, your typical post-apocalyptic world is modelled after the world of YKK: life is easy, water and food are plentiful, the cities had been overgrown with verdure and flowers, the minuscule number of survivors can scavenge anything they need from the abandoned shops, and the only wild beasts around aren't deathclaws and nightstalkers but cute fluffy cats. Everyone is nice to everyone and you can just laze around all day long enjoying yourself.
Western fiction needs to learn the lesson from manga. Totally.