Published in English by Del Rey - Capsule Arc under "Gacha Gacha" title, Sep 20, 2005~Aug 29, 2006 (Volumes 1-5) and Secret Arc under "Gacha Gacha: The Next Revolution" title, Dec 26, 2006~Mar 23, 2010 (Volumes 1-11, volume numbering restarted from 1).
Volumes 1-5 are the first story arc. Starting from volume 6 serialization moved to Magazine Special, and a whole new set of characters take the story off in another direction. Because of this, the chapter numbers were restarted back to 1 for the first chapter of volume 6. (Source: Del Rey)
Capsule; Shounen Magazine 2002 #36+37~2003 #29; Total chapter count is 41.
Secret; Magazine Special 2003 No.8~2007 No.11; Total chapter count is 55.
Miniature (みにちゅあ); Magazine Special 2006 No.6
Mikio teases his neighbor Mariko a flat-chest and she calls him a midget. When one day Mikio turned miniature and ended up in Mariko's care, they discover how wrong they are about each other. (Source: MU)