The concept of this movie is actually quite good. It's a mix of horror and feel-good. The monster isn't frightening but it works. The overall collecting is pretty fun to watch especially since they're bonding over something so unusual.
The other characters are alright. Some are a little more interesting than others.

One thing that absolutely annoyed the living buffalo frick out of me watching this though is the main character. MY GOD ASUKA, GET OFF THE FLOOR AND DO SOMETHING USEFUL.