OP of TV anime Lucky Star "Motteke! Sailor-fuku" CD singles was 
released on 23 May.  The OP is sung by the 4 lead female 
characters : Izumi Konata (Hirano Aya), Hiiragi Kagami (Katou 
Emiri), Hiiragi Tsukasa (Fukuhara Kaori), and Takara Miyuko 
(Endou Aya).

The single CD is a big hit and immediately ranked 3rd in the 
Singles daily Oricon chart.  It stayed in the top 20 since 
then.  

The newest Singles weekly oricon chart has it ranked 2nd at 
65907 copies selled, just losing out to V6's Jasmine (68461
copies).  Many people said that it lost out due to not 
enough stocks to support the rate of sales.

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Shameless plugs : my Lucky Star location hunt photos :
http://www.cuso4.org/photos/tyo20070511/20070511-tyo-rakisuta.htm

Note: 
There are quite a few Japanese Lucky Star Location Hunt sites, but
none have found Konata's house and Kagami's house yet (or maybe they
found them but have not showed them yet).  So mine has the edge here.
Mine is also the first (and more extensive) to show the Miura-kaigan 
locations (I went there 12 hours after the broadcast of that episode
in the Greater Tokyo area).

ps. 
Sebastien, did you said you live in Satte-shi in Saitama for a 
while ?

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'CuSO4' Yung                          cuso4@cuso4.com, cuso4@cuso4.jp