Crow is ML, and apparently there is some voodoo shit going on that when she dies and reincarnates it's like her soul is shifting into a parallel universe. Looooong story short, MC's fiancee is a cheating bastard each time, but eventually crow falls for her and tries to save her in each universe, and eventually MC gives up on scumbag fiancee and looks forward to crow's visits, and finally they reach a universe where both of them live happily ever after, in love with each other.