Hm, I didnt really get what you said, but basically :
Elise = 1st life as Elise, 2nd life she took over Song’s body, 3rd life back as Elise again
Song = Is elise’s reincarnation (means the soul transfers but normally not the memories nor the personnality), and had her 1st life taken over by Elise’s memories making her 1st life Elise’s 2nd life. In her 2nd life (the one in the ending) she’s still elise’s reincarnation but this time elise’s memories did not take over. Since in her 2nd she’s now her own person , her fate changed and she will make different choices than Elise, so she prob will not die in a char crash
Makes sense...
I finished reading the last chapter and went to look at the first chapter. And I realized one thing: the protagonist, before being reincarnated in Elise, was called Song. And Elise's reincarnation was also called Song. I wonder: Isn't this Song (from the last chapter) going to be the genius doctor who reincarnated in Elise at the beginning of the story? If it is, it will be kind of sad, because she dies in a plane crash.