First time Japan, what’s the siren?

Edit: I walked through Osaka and I heard the sound again!! It was the police alarm! https://youtu.be/GCszQZoSjvY?si=K3NpVjaMMOkgmicB

Hi everyone, I arrived at Osaka yesterday and this night I woke up to what sounded like an raid siren.

At first I thought it was a warning to an incoming earthquake, but there wasn’t one. It also didn’t sound like a song, so it wasn’t the 5 o’clock chime that I found online.

Am I tripping or does somebody know what that alarm was?