>>25518
>What happened after the 2nd movie?
After credits kinda hinted that everything turned back to normal, and Miho is recovering in a hospital where she meets one of her fans, Key.
>do all of them go back and live in the valley to forget what happened in the city and to start a new?
I personally don't think all of them went to the valley. The idol agents will probably return to working in the entertainment business and maybe be Miho's new agents, Tataki could stay in the city and visit the valley as much as he pleases, and the Priest will return to the valley or continue to stay in the city while influencing more people to believe Key and her abilities. As for Tomoyo, he's either dead from killing Sergei by attaching c-4 to the latter's forehead, and stabbing it with a military knife, or he miraculously survived and went back to the valley with Key.
>does key and that boy from the cult start a family?
Maybe.
>does the manga tell more?
Unfortunately there is no manga for it, but there are a couple of radio drama cds that give more depth to the series which is something that I hope to collect and translate once I get the hang of and mastered moonspeak.