From childhood we always see perman.We like most  this series because the love of pako & perman & from the manga we know that perman goes to birdstar. This is so emotional ending.We saw that sumire is a regular character in doraemon & she waits for her best friend. Tv asahi networks knows that perman series has one of the great ratings in animations.We know perman also saw pako is sumire in the end of perman in manga.But we don't know perman ever come.So make a movie on it.So we will see perman's happy ending.