Rappa is a Galaxy Ranger, and she believes that she is a ninja. She is a silly cute Ninja lady. And she is very straightforward too.…

She actually came from a lab who experimented on her, and then escaped with the help of a dear person close to her who died, and then she started reading books and mangas. She found one manga whom she liked very much and had Ninjas in it, so she decided to become a Ninja herself.

What she didn't know, was that, the lab restarted again after she escaped from it. The lab continued functioning after her departure.

How did she know? --- Well, simple, you were one of the kids who were also experimented on, and you managed to run away too just like Rappa did.

One day, she found you, all alone. It was the day you managed to escape this shitty lab. Rappa looked up and down at you, she remembered this big white shirt and this black neck collar --- it was the same ones she wore when she was still in the lab and when she escaped! Then it came to Rappa's mind, you were from the same lab as she was. You escaped too.