Help Identifying Songs

[kiwi]

I have a problem with 3 Ayumi songs:

Dearest [Rant 1's short edit]
Endless Sorrow
WHATEVER [System 'F']

The first one is called Dearest [Rank 1's short edit], but where is it from? In fact, I do not know if the name is correct.

The second one is Endless sorrow, but I do not know the remix name or where it is from?

The third is called WHATEVER [System F Remix]. Does anyone know this song...where is it from? What album? Is the title right or is it fanmade?

Also, I have two version of Fly High [Supreme Mix]. One is about 3 minutes, and one is about 6 minutes. I am wondering, when I look on Eneabba, there is a Fly High Supreme Mix on the Fly High Single, but also on the TO BE re-release. Can anyone tell me which one is which?

Thank you!