My roomate and I have been collecting for YEARS 
and she says she's seen this sold at least one 
other time as a OP cel, which may have started 
the confusion.  BUT, I do have all the OP and 
closers from RK on my harddrive and I can't find 
that cel, or a sequence anywhere close.  I even 
double checked Dame and the other OP/ED with 
screen cap credits, so unless I'm REALLY a lot 
worse at cel spotting than I think I am, I'm 
pretty sure that's not a OP/ED cel.  ((look at 
the artstyle, too.  All the OP/ED that weren't 
screen caps have a very unique style that you 
just don't see in that cel.)) Its still a 
beautiful cel of Koaru, tho, no doubt!