Kimagure Orange☆Road: Ano Hi ni Kaeritai

This is the first movie which could be called a spin-off because it's an original piece of work written by Kenji Tereda, the main scenario writer for the TV series rather than based off the original Manga.

It takes on a more serious tone during the summer when Kyousuke is preparing for university entrance exams. There's no mention of supernatural powers nor are any used, just your slice-of-life romance. Kyousuke's originally kind indecisive character is changed to be more cold and decisive so it's no longer a romcom and can be quite bitter which is probably why it was ill-received. Even Izumi Matsumoto criticised the work, ... suggesting viewers took it as a parallel world story instead because of how harsh it was.

The supernatural powers were partly what made the original TV series fun so with the sudden change in mood and powers left out, it just feels like your bland romance movie.