Tokyo, My Childhood Friend is a Ghost Story

Good news! Reborn in an island nation, I have a slender, alluring childhood sweetheart.
The bad news is that this childhood friend can split infinitely, can also mentally control others, and has a fiery temper.
Good news! A timid, tall girl has moved in next door. She's gentle and delicate, and very endearing.
The bad news is that after she dies, she will become the first super demon to break the "don't kill if you hide under the covers" rule, possessing, but not limited to, multiple abilities such as infinite clones, shapeshifting, spacetime control, and the spread of evil thoughts.
The girl who hasn't become a demon: I only need a tiny bit of space... really just a tiny bit, even if it's just helping out behind Kasyapa-kun...
The endlessly splitting childhood sweetheart: Just thinking about the scene in my dream where she walked out of the operating room with a scalpel the moment her child was born, a wicked grin on her face, asking whether to save the doctor or the nurse... This despicable woman needs to stay, but I need some methods to control her...

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