You can find it in Mangafox or Onemanga.
These are free manga reading sites.
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You can find it at www.onemanga.com Or at Borders
IF you want to find it you need to look up "mermaid melody pichi pichi pich manga online" when you do scroll down until you find manga fox . click on it. It is a hidden manga so you can only find it if you search Google. its only up to volume 6 and it stops half way through but its still there. if your looking for another manga look on manga hut, one manga, manga volume, and manga fox!Mew xxi found a website called manga.animea.net and i found mermaid melody manga, Hope i could help out!!
Some sites are Bleach exile, mangavolume.com, anymanga.com,and manga.animea.net. You can find more sites at read-manga-online.com.
you can read vampire knight at www.onemanga.com (that is a vampire manga if you didn't know) vampire knight also has an anime if you want to watch that too. you can find that on www.crunchyroll.com
You might find Basara a good read, it's a romantic, historical manga with a similar war back drop.