Ok, so I just recently finished Happy Strike and decided to add it to the site since there wasn't a series page to it nor any mention of it here. As it turns out there's 4 of them in total in Comptiq version(?)

Happy Strike was published first in 2007 (発売日：2007年 09月 26日)
らき ☆ すたコミックアラカルト ～はっぴーストライク!～
http://www.kadokawa.co.jp/comic/bk_detail.php?pcd=200706000132

Then Lucky Turn (発売日：2008年 03月 26日)
らき ☆ すたコミックアラカルト ～ラッキーたーん♪～
http://www.kadokawa.co.jp/comic/bk_detail.php?pcd=200711000059

Then this one I don't know the english equivlent for, (発売日：2008年 11月 05日)
らき ☆ すたコミックアラカルト ～ラッキーすぱいらる～
http://www.kadokawa.co.jp/comic/bk_detail.php?pcd=200805000033

And finally the most recent Brillant Star(発売日：2009年 03月 26日)
らき ☆ すたコミックアラカルト ～ブリリアント☆すたー～
http://www.kadokawa.co.jp/comic/bk_detail.php?pcd=200811000421

I think the associated names section's going to be messed up but I'll keep it like the Full metal panic novel page for now.

The first of this series was published in 2007 as stated above, so Happy Strike was the first, not Lucky Turn.

As for how this set relates to the main Lucky Star, I'm at a loss since this goes on its own slice of life pace that lucky star has and they're still in the school and cast. The only difference is that it's not in the 4 panel form but regular manga panels. 😕

[img]http://dragcave.net/image/XIBD.gif[/img][img]http://tinyurl.com/8uczzq/.gif[/img]