It changes big time in volume 5 and where it kind skips forward a bunch of years and acutally has a proper story! Not gone past that yet so I can't say much more than that.
In America, this series is going to be made web-exclusive from volume 9 onwards (meaning you can only buy it direct from Tokyopop USA, not available in the shops). Not sure how/if that's gong to affect how we get it over here though...