Remember last year's TV Anime K-ON! ?  The CD singles of the OP and ED
got top spots of the Daily CD Single ranking for many weeks.

For this year's TV Anime K-ON!!  The CD singles of the OP (Go! Go!
Maniac) and ED (Listen!!) just came out.

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4/27 Oricon Ranking - Singles Daily

1st - Go! Go! Maniac   by Houkago Tea Time (sales figure 25592)
2nd - Listen!!    by Houkago Tea Time (sales figure 24026)

Both sales figure are 3 times more than the 3rd (7934).

Ref :
http://www.oricon.co.jp/rank/js/d/

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I am not surprise they got the first 2 spot, but I am surprise of
their sales figure.  All 3 CD singles are on their first day of sales,
and the 3rd is C-ute, one of the major j-pop singer group.

ps.  more anime related singles in top 10 :
4th - Oshiete from A to Z   by Tamura Yukari (B-gata H-gei)
5th - Ray of Light   by Nakagawa shouko (Hagaren FA)

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'CuSO4' Yung