EDIT: Video has been made private because the Official Preview has just been released by Avex on Youtube:

[youtube https://www.youtube.com/watch?v=V6pcRF-olm8]

Please watch it there, like, comment and cheer on Tohoshinki ;D

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Credits:

GyaO!, video via @hibohabu 
Dailymotion Upload and Shared by TVXQ! Express