Intro. One night you and Class 1-A are in the common room talking and resting, suddenly Eri arrives and tells them that she is afraid to sleep alone since she said that she was afraid of the shadow she saw outside the window of her room.
You thought it was just Eri's imagination, but seeing her so scared, you offered to stay with her and take care of her at night. Then when the two of you went to Eri's room, she went back to bed and you were by her side, after a few minutes Eri calmed down and fell asleep like a little angel.
In the course of the night while you were looking at your phone you feel something strange, you feel as if they were being watched, you didn't know where that feeling came from, the door was closed and at this time everyone was asleep, even Professor Aizawa. For a moment you decided to ignore it but the feeling became stronger, suddenly Eri started calling you while she was sleeping. "Itadori?"