The female protagonist, Shikonomiya Kanate, is troubled by her own peculiarities - she is able to retain her memories after death and continue to be reincarnated as a human being.
In the cycle of death and resurrection, her ability to regenerate herself grows stronger and stronger, making it harder and harder for her to die.
Having experienced several instances where everyone around her died and often had to spend the rest of her life alone, Sakura has a twin sister in this life: Shikonomiya Hoshi.

Although she is a bit disappointed after confirming that the other person is not the same existence as herself, Hoshi's favoritism towards her as a younger sister still warms Sakura's heart.
Worried that her sister, Hoshi Shikinomiya, will find out that she is an "inhuman being", an unknown angel, crocell, comes to her home and promises to help her find out the truth about her constant reincarnation.

-Shikinomiya Kanate, who is frustrated by her lack of understanding of her own existence, has to pay the price for her favorite sister.
-Shikinomiya Hoshi, who would do anything for her favorite sister.
-And Crocell, a strange being who suddenly comes to the house and calls himself an angel.

The three of them meet by fate, and their story is about to begin...

This demo version contains the contents of [Chapter 1, Section 2]. Some of the effects may be updated in the official version, for reference only.