Search for a missing person in Japan, mid-late 90s

[ingriam]

How long would someone generally need to be missing before the police would file a report? Or does that vary between prefectures? Also, what - other than the name and description of the missing person - would go into the report? I tried Google, but all I got were US police pages, and some action movies, believe it or not.

Can you guys help me out?

Search terms used: Japanese police procedures, missing persons, late 90s