Safety, Lost Children & Lost Items

Where can I get help if I get separated from my child, or get lost myself?
Shopping facilities, theme parks, and stations often have a lost-child counter or a PA announcement system. On the street, look for houses or shops displaying a "Kodomo 110-ban no Ie" (children's emergency help point) sticker — anyone, not just children, can ask for help there.
Who do I contact if I see a child who seems to be in a dangerous or troubling situation?
Call 189 ("Ichihayaku"), Japan's nationwide child welfare consultation line — it connects you to the nearest child guidance center to report concerns like abuse or a child left unattended. If it feels urgent, 110 (police) works too.
Who do I contact about a lost item — the station, the police, or the shop?
If you left something on a train or bus, contact that line or company's lost-and-found office. If you lost it inside a store, start with that store. If you dropped something outdoors or think it may have been stolen, go to the nearest koban (police box). If you're not sure, a koban can point you the right direction.
Is it okay to keep hiking or playing in a river if a weather warning has been issued?
No. When a municipality or the Japan Meteorological Agency issues a heavy rain, flood, or landslide warning, ignoring it and continuing to hike or wade in rivers has genuinely cost lives most years, through sudden rises in water level, flash floods, and landslides.