An extra long chapter this time, nice.
I guess this...slenderwomen?...is related to what the alter was originally for. It appears to be different from the Jumping Women. Her arms are normally raised while on the talisman arms are always down.
I noticed that some of the phenomenons seem to heavily target women. Most of the victims are women and even the shrine dolls appear to be mostly feminine (it even has an anime figurine). The exception appears to be the Jumping Women. Perhaps these phenomenons are looking/targeting her?
On a side note, I really wish they labeled the chapters. The editor parts of the story constantly reference them but there are already so many and apparently more to come, it's hard to keep track.