inertia!! can you explain this to me?

hello inertia! I recently came in contact with the anime rose of versailles and, me being so horribly misinformed haha, listened to the opening song and it was kamijo's song bara wa utsukushiku chiru. is kamijo just a singing cosplayer? I heard about this anime a long long time ago and i always wanted to see it but i had no idea at all that it had a connection to kamijo. well anyway to the point...i just wanted to ask you if you could explain this thing to me? I am confused. for people who find out about lareine on the internet it is hard to find real info on kamijo. i also found a person on youtube who thought that the urban dictionary thing is true so i told her it wasn,t and linked her back to our other little conversation.that person even has a site with info on lareine! and i was like "this is so bad". it is sad that so many are so misinformed...
well anyway that urban dictionary thing has got to go... thank you for taking the time to read my concern and thank you for being so dedicated to your passion! you are the best!!