Hilton has a 72 hour flash sale for its properties in Japan, South Korea and Guam, up to 50% off. Book before 24th November 2017, 2pm JST. Stays must be between 21st November 2017 and 30th June 2018. You must also be a Hilton Honors member. If you are not, it is easy to sign up and join online.
You can access the link for the flash sale here.
Regular travellers to this part of the world know that good hotels in Japan and Korea are very expensive, unless you have generous corporate rates. A 50% offer is a no brainer. Remember, rates are totally non-refundable.
See our review of Hilton Tokyo here.