Couple of guys literally throwing crackhead men in the air for a challenge to see who gets the farthest!!!!!!

A few lines are missing and others might be wrong. It's possible to follow the movie with these subs though. Any help is welcome to improve this subs.

I couldn't figure out the point of Ayako's older sister (Mitsuko), some lines are missing in an important dialogue. Also, who's the young girl who finds the wind spirit near the ending and the little orange man mentioned in the english class. Any ideas? :P

This is the shrine mentioned in this movie.
https://ja.japantravel.com/%E7%A6%8F%E4%BA%95/%E6%88%A6%E5%9B%BD%E4%B8%89%E5%A7%89%E5%A6%B9%E7%A5%9E%E7%A4%BE/15978?fbclid=IwAR0cVtPpMf08TKyUNPsFtmd7fX4nWxfQZT5YF_snHcfYoADbSXjPg_sDXgA