Wow, thanks for posting this link. Respect to Coldplay for trying to sing a Japanese song.
The song was written by Makihara, a famous singer/song writer in Japan (he wrote a lot of songs for Spam... I mean Smap as well)
Noriyuki Makihara - Wikipedia
I would love to go to a concert like this in the future, when I've got more time, and more friends in Japan
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