[Dragosmore]

If you want some big spoilers, here's some of my translated lines from my scripts around eps 27-28:

Spoiler:

Hippo: The South Pole Mermaid Princess, Karen-sama, and the North Pole Mermaid Princess, Noelle-sama, were born special twin mermaids chosen by fate.
Hippo: However, her older sister, Noelle-sama, was captured and brought to Kaito's palace and Karen-sama is really hurting because of that.
----
Karen: *thoughts* Noelle... I will see you again. You're my beloved sister who was born unto this world with me.
Karen: *thoughts* Every day, I longed to see you... but...

FLASHBACK

Karen's Maid: Karen-sama, Noelle-sama has... your big sister has... been captured by the Panteras! { The Panteras is that weird big ugly fish thing that Kaito was riding on in Ep13 or whatever... }
Karen: What did you say?!
Karen's Maid2: Your gentle sister, Noelle-sama, was with the North Atlantic Mermaid Princess, and to save her, sacrificed herself!
Karen: N-No way...
Karen's Maid: The North Atlantic Mermaid Princess, Rina-sama, left Noelle-sama behind... and escaped to the forsaken human world!

END FLASHBACK

Karen: *thoughts* Rina... why did you leave Noelle behind and go alone to the human world?
Karen: *thoughts* I'll show you! I'll definitely show you and save Noelle! Alone/By myself!

Spoiler:

Rina: Aqua Regina-sama! Then, the two of them, where are they now?!
Rina: I have to save both Karen and Noelle!
Luchia: Rina... why are you going so far for them?
Rina: I wasn't able to tell you until now, but Karen doesn't trust in us because she thinks I left Noelle behind, and escaped myself...
Rina: When there was fear of Kaito in my country, Noelle tried to save me and got caught instead...
Rina: Karen didn't the full story of what happened, and thinks I'm a traitor...
Hanon: So that's what it was...
Rina: Luchia, Hanon... I'm sorry that I stayed silent about Noelle.
Rina: I thought I'd be able to tell the both of you one day, but... but...
Luchia: Rina, one's true feelings can't always be expressed in words, right?
Luchia: But, you know, they /are/ understable even if you stay silent. That's what friendship really is!
Hanon: She's right, Rina. That's what friendship really is!
Rina: Luchia... Hanon...

That should cover things fairly well :P