Why don't I relate my encounter with that creepy girl in the rain?

Her name is Rena Ryuugu.

Her real first name is Reina.

I have no idea what kind of girl she really is.

One thing is certain. She has no relation to the Sonozaki family.

She has no relation to the Three Families as a whole, either.

The Ryuugu family used to live in Hinamizawa,

but then they moved to Ibaraki.

That was before she went to elementary school.

...They returned to Hinamizawa some years later.

Rena Ryuugu said she came back because Oyashiro-sama told her to.

I don't know what that means.

She said it was the curse of Oyashiro-sama.

That Oyashiro-sama had stalked her.

I think that was probably a hallucination, but Satoshi-kun had been interested in that experience.

She said that Satoshi-kun was also experiencing Oyashiro-sama's curse.

Satoshi-kun told her that he was being followed by some unknown existence.

He was surprised to learn that Rena had the same experience before.

What is Oyashiro-sama's curse...?

Why did Rena and Satoshi-kun have a similar experience?

I believe that means that somebody put them under surveillance.

Somebody must be spying on the next victim of the curse.

......Since Rena and Satoshi-kun both blindly believed in Oyashiro-sama's curse, they interpreted it as Oyashiro-sama's presence.

If paranoia kicked in, they'd feel as if they were experiencing paranormal phenomena.

Judging from what Rena said, it seems that Satoshi-kun had been put on surveillance since long before Watanagashi.

So,

one question comes to mind.

Why were they watching Rena?

I'm assuming that this surveillance was placed on a victim-to-be of that year.

If so, I don't understand why Rena went through it.

Why did they watch her, even though she was living so far away?

If she was considered somebody who abandoned the village, I could understand.

But she didn't fall victim in the end.

Maybe she was forgiven because she came back to Hinamizawa.

...I guess she still knows something I don't...