If you want a cheap flight from Manchester to Osaka, you've got four airlines to choose from.
Make sure you use the search options above to search for flights to other airports in Osaka, not just Osaka Itami Airport. The more options you look at, the better your chance of finding a cheap deal. Just so you know, the flight typically takes 20 hrs.
You can expect accommodation prices to be higher at this time of year too. Last-minute deals do crop up, but it's best to book everything in advance to avoid disappointment.