Holding hands on the beach

Am I going to draw one or more ladies in swimsuits every week? Probably not.
As for this picture's premise, maybe I've been watching too much of that Carmilla web series.

These are not characters from that, but they are characters with names.
First person to identify them by name gets a prize. Prize won.

They are Aiko, the Outrageous Teen Assassin, and Claudia, her... er... support?

They were already having adventures together as children.