Nope

how do i unlock the third last scene(the first Chloe replay)?

The story is among one of the best of all the AVNs I have played. I always loved to read cultivation manhua, making this a feverdream. I love all of the chapters, especially Chapter III, but

WHAT WAS THAT CLIFFHANGER!!!

Is there a walkthrough?

You can try finding the Eternum folder that might be stored externally(In the home folder(/storage/emulated/0/)) or internally(In the the android folder(/storage/emulated/0/Android)(Most likely in it's data folder)). In that directory's game directory, you will find the saves directory. You just need to copy it to your pc's same game directory and I guess you will be able to continue playing it on your pc(though take it with a grain of salt because i haven't tried it).

Muck