Opinions on the biggest Japanese hit of the year (so far)?

[abra]

back number's Happy Birthday is the biggest hit of the year so far in Japan, topping the download charts for 6 non-consecutive weeks.

 

https://www.youtube.com/watch?v=vQggClynaVc

[WonderTwice]

sounds like something for an anime

[Misa]

I love it!

[Mami3chan]

I love it!

[Vayafish]

I know the song cause i watched the drama, it somehow sounds nostalgic

[mikmak]

Damn, I love this so much. Off to watch the drama now!

[haruko]

Wow, imma download the song now. Didn't know this was soo popular in Japan. I admit I loved the song whenever they played it in the drama "Read This on The First Day You Fall In Love". 

[Jotham]

Hope this is their next big hit like "Christmas Song"