The manga comes from Akihisa Ikeda which came out between 2004 and 2007 with a sequel series that ran from 2007 to 2014, totaling twenty-four volumes that Viz Media has released.
Viz Media has kicked off its latest digital series sale on the manga front where you can get a lot of material for a pretty sweet price – without the storage problems!
The latest series to get the treatment via ComiXology (and Amazon) is Rosario+Vampire where the full series and its second season are now priced at just $4.99 a volume.