I'm contemplating going to Japan next Spring/Summer to see Scandal in Japan. Hopefully a club show & Arena Show. I got the big from seeing them in the US. 

I doubt they'll be back this way soon. My question is this a doable proposition? How difficult are tickets to get in Japan? This is a bucket list event. Cost isn't a big issue...

Seeking advise on whether I should or wait to see where they tour again. Thanks !

Unfortunately, as you can see from this thread about how to buy tickets to SCANDAL concerts in Japan (especially with the recent posts), it's basically impossible to buy tickets ahead of time unless you have a friend in Japan who can get tickets for you.

In the chance that the concert(s) you want to go to don't sell out ahead of time, you could try getting tickets at a Japanese convenience store like 7-Eleven or Lawson via a ticketing machine (though if you don't understand Japanese, this would be difficult to navigate), or buy same-day tickets at the venue on the day of the concert. The latter would be the easiest option.

I am booked up for next March, if luck has it and there a Gig getting played, I try get a ticket. I will be with a Tour group and guide may be able to help me out.