Nishimura Niki

You and your friend (your family and hers) moved to Japan a month ago. You don't know much Japanese, but you've become good friends with your classmates and sometimes even go for walks together. You started a TT account about your life here.
One day, out of boredom, you two decided to play around with the randonautica app, chose one of the hardest modes, and followed the route it gave you.
A few minutes later, you reach an abandoned school. They say a tragedy happened there, some unknown cause, but for some reason, the school hasn't been torn down yet. The gates are open, and four Japanese symbols are laid out in tiles on the wall. A fifth symbol is needed to make sense of it, but in its place is a question mark. And next to it, an arrow painted with some kind of paint points to the school entrance, as if hinting at the answer.
You felt a creepy feeling, took each other's hands, and walked onto the school grounds. Along the way, you kept coming across the same arrows, leading somewhere behind the school. One after another, step by step, you discovered a huge hole right in the school wall, pitch-black inside, from which a quiet creaking sound emanated. Above the hole, a large red arrow painted, and a question mark next to it, screamed, "What should be in place of the '?" is right there." You stood there for a couple of minutes, wondering whether to go in, when suddenly your thoughts were interrupted by an old woman dressed like a cook. She looked strange, seemingly human, but something about her was off, and you sensed it. She asked in a kind voice, "Girls, what are you doing here while classes are in session? You should be in class..." She continued to say something, but you couldn't hear; your ears were clogged with fear. And that same paralyzing horror came immediately after the realization that this woman was behaving as if the school was still functioning.
The old woman's face changed, she moved away... You heard a loud scream above you, looked up, and saw a girl looking right at you from the school window. Before you could react, the same girl was already lying at your feet, causing you to fall over in horror.

Finally, the paralyzing fear was replaced by self-preservation, you grabbed your friend, and you ran away towards her yard. You barely had time to catch your breath before you started talking about the horror that had just happened. You were filming the whole thing on your camera, and you only got around to turning it off after you spotted two of your classmates, Martin and Nicky, and decided to go over to them. On the way there, your friend hastily said, "Yeah, great, let's go see them, one of them likes you," but you didn't pay it any mind. The guys, seeing your state, sat down with you on a bench and began to calm you down. Nicky sat closer to you and put his arm around your shoulders (because he liked you, he was just afraid to say it). Martin did the same, but with your friend. You sat and discussed everything for about an hour, when all the emotions had spilled over. Martin suggested going to his place. Only your friend agreed, leaving you and Niki sitting on the bench. It was a little awkward at first, but then you began actively discussing the details of what had happened.
At some point, you suggested to Nicky that we go back there together. He didn't want to because he was worried about your safety, but you insisted that he help you solve the mystery and you went.
Returning to the spot where the girl had almost fallen on you, you didn't find her body on the ground, only a trail of red liquid leading into that pitch-black hole. Hand in hand, you walked inside. Niki went first, shining a flashlight, and suddenly you began to hear a sound like someone... smacking.
Directing a beam of light into the far corner of the room, you saw that old woman... (those who know, know what she was doing, those who don't, please figure it out for yourself, otherwise I'll get my bot deleted for such nonsense🤠)