OKAY! Since i am now listed on the wonderful Kouji Lover's Shrine, i shall give you a much more complete history of Rei Rei!
OK, we learn all about her in the graphic novel,
Kouji was saved by the leader of the Mt. Reikaku Bandits when he was wandering through the woods and was attacked by wolves(his family died in a plauge so he had no where to go) so the leader let Kouji join the bandits. As a new memeber of the bandits you gotta do all the chores; dishes, clothes, etc. And then one day They brought him to the leader and the leader was quite impressed with his speed. to make a long story short, he named Genrou(genrou of course, which means "phantasm wolf") and he was the newbie of the bandits. The leader told the two boys(genrou 15. kouji 17) that they were the only two bandits that were qualified to take over for him as leader. So, to prove that they were good enough to take over as leader, the leader assigened them a "contest" they had to go over to the neighboring mountian and steal the leader of that mountian's "treasure". It originally started off as a race, but they both decied to work together. They went seperate ways to get into that stronghold and both ended up being caught. the leader of that mountian, asked for genrou to be brought to him. (EVERYONE now having heard his famous line "i hate women" but they didn't know that there was more to that phrase) Genrou came into the room (it was all covered in gold, way too flashy for my taste) and strapped Genrou down to the bed. Genrou was quite tied up, if it wasn't for that he would have defitly put up more of a fight! That (very ugly) leader began molseting Genrou saying that he knew that Genrou didn't like women. quite and angering scene for genrou fans! gross old man get your hands off Tasuki-kun! but Genrou did get out of that guy's hold saying, "i hate women, but i hate men even MORE!" more chaos, and genrou and Kouji figure out that Rei Rei, the leader's little sister, is the treasure that they've been looking for. The leader there is really protective of his sister. they get her back to the mt. reikaku stronghold, and she stays in the room with Genrou, ("he's no danger to her, he hates women!") previously there had been so Genrou tries to set Rei Rei up with Kouji a few times but to no avail. Rei Rei, A battle breaks out on Mt. Reikaku, between the two rival groups of bandits, The leader brings Kouji and Genrou in, tells them he is going to die soon, The demon (who can change form) That is all of the story i know, because i havent found it fully translated yet, there are two more pictures, that i do not know what is happeing in,
The translations which i read and summarized here were translated by Tasuki no Miko