You are welcome with your UAV in Japan
Maximum take-off weight: No limit
Maximum hight: 150 meters / 492 ft
Maximum horizontal distance: Keep visual contact with the UAV
Insurance: Not known
Distance Airports / Heliports: 9 km / 4,7 mi.
Night flights: Prohibited
Prohibited: Not above roads, public parkts in Osaka, Tokyo, presidential palace, governement buildings, nuclear powerplants,
railways, waterways, beaches, festivals, parades. If you still do something that is prohibited, then you wil get a fine YEN 500,000,-
Newly added June 16, 2019: It is not allowed to control a drone under the influence of alcohol. If you do this, then you run the risk that you will receive 1 year in prison and a fine up to 300,000.- Yen (USD 2,790.-).
Useful links: Japan Civil Aviation Bureau (JCAB)
Contact info: firstname.lastname@example.org / +81 3525 38111