Acquiring Ledah(for CH8) and the Rose ending Options

[Raijinili]

I'm a little curious, but since there is an empty slot and it's fairly obvious as to who it is....

I would like to know how to unlock Ledah for the extra chapter as I have checked and i haven't found anything very useful though i have heard that getting the Rose Ending would unlock him but I'd like some confirmation

And I'd also like to know how you get the Rose Ending and if there are any other versions of the aforementioned ending as i had also heard that there was two different kinds, one where everyone was kinda ...meh with you but ierra kinda liked you and another where they were meh to you and ierra was the most meg to you....