It was a duty placed on me a long time ago and, yes, I suppose you could say I was born into it. [It was her destiny after all and a duty given to her by the Queen herself. She can tell he doesn't approve however and shakes her head.]

I lost my family a long time ago as well and I am the only one capable of the special duty tasked to me. [She pauses and then smiles slightly.] But times have changed since the original assignment. I have a new family now and I do not have to be quite so alone any more. We work together now to face any threats and we all share the common goal of protecting our princess and the Earth from harm.

[She realized it must sound vague, but again she wasn't sure how to explain all of the details as her role as guardian of the doors to time and space. Not to mention the life of a sailor soldier who guards a special moon princess from the outer rim of the galaxy. To most people it would likely sound like a fairy tale.]