In fact, Beichuan Si had long noticed something off about the walls.
Even from the content of the letter handed to Nakahara Shoko, some things could be inferred.
For example, this phrase 'Mrs. San Yuan, who lives next door, told me that strange noises always come from your room, Mr. Sato from the third floor and on the same level as you also... These people have all reported to me that you are indeed too noisy at night...'
Was Nakahara Shoko really doing this out of unbearable anguish?
Let's reorganize this slightly.
First was the apartment's initial missing person, Nakahara Kyou.
He vanished for unknown reasons.
This might be an abduction, or he might have been pulled into another world by some non-human presence.
Then came the second missing person, Nakahara Shoko.
She disappeared suddenly as well.
Followed by the third... the fourth...
The common link among these people is... They were all tenants living in this apartment building.
