The band announced the news on Twitter, saying that they'd be performing alongside 1D on their tour dates in Osaka and Tokyo.
Calum Hood recently tweeted about how excited he was to go to Japan, and now we know why!
Hitting up JAPAN soon! Words can't describe how excited I am 😁— Calum Hood (@Calum5SOS) February 12, 2015
It feels like it's been too long since these two bands have hung out — and we can't wait to see them get together again. Prepare for all the feels!
Are you excited about this news? Do you think it's been too long since they've hung out? Tell us in the comments!