Well what had happened was
Kanye has been feeling the idea of a Phoenix - rising from the ashes - before he even ruined his career - he said he would do it at the Gaga tour (something along the lines of it)
But than he ruined his career in a big way - and he wanted the comeback to be like a Phoenix
So a Kanye is being his cool self - and a Phoenix falls from the earth (just think of her as an alien since that's more common)
He begins to show her his world and **** - and at the dinner scene everyone judges her - so he has a toast for the 'doucebags' who are so judgemental. Than she see's a bird and than freaks the **** out like omfg and screams like a bitch and scared everyone off and Ye is like *facepalm*
So than after that trip out she's like sitting with him and she's like "**** YOUR WORLD IT SUCKS EVERYONE JUDGES ME THEY CAN'T ACCEPT ANYTHING THAT'S DIFFERENT THEY ONLY JUDGE JUDGE JUDGE (probably like a lot of ignorant people will do with this movie because it's different - symbolism maybe) - I'm going to burn myself alive so I can go back to my home!"
And Ye is like "AW **** NAW NAWT UNTIL I HAVE MY WAY WITH YOU ATLEAST ONCE" and rapes her (not really tho it she was in consent...I believe)
And than she basically plays him for a fool and Ye wakes up and he realizes she's gone so he runs like a mad man but it's to late she already burnt herself alive and has thus
'Runaway'
It's basically reminicent of his career in a big way. He's always doing different things and people judge him so he made this. The visuals + music was amazing

!!