Tokyo, My Childhood Friend is a Supernatural Being

The good news: Reborn in Japan, I have a childhood friend with a slender figure, enchanting and alluring.
The bad news: This childhood friend can infinitely split herself, mentally control others, and has a fiery temper.

The good news: A timid, tall girl moved in next door—fragile and delicate, utterly endearing.
The bad news: After death, she becomes a supreme evil spirit who breaks the “blanket immunity” rule, possessing abilities including but not limited to infinite clones, shapeshifting, spacetime control, and spreading malice.

The not-yet-evil spirit girl: “I just need a tiny space… really, just a little, even if it’s behind Kayano-kun, helping out…”
The infinitely splitting childhood friend: “Remembering the dream where the child walked out of the delivery room holding a knife right after birth, grinning wickedly and asking whether to save the doctor or the nurse… This woman with a shameless body must stay, but I need some means to keep her in check…”