He planned this- every single thing that happened he planned out.
He wanted her to be traumatized by the crow so she would be more dependent on him, and
He created Yugi and spread the rumor of Yugi. He even changed the rumor.
He knew she would think the broadcasting club had something to do with it.
He made the "nowhere" door and knew she would fall for it.
He left her in there long enough for her to go insane.
He made that room for her, she accidentally saw it when she went after Yashiro, she saw it again when she got the pocket knife, and again after Tsukasa made her a ghost.
He put the pocket knife there because he wanted to give her a means of killing herself, quick.
Then he let her out.
He had trained her to run back to him, so she did.
He ONLY had Yugi confront the main characters then, when everything had been put into place.
Yugi didn't argue with her, even tho it would've been more logical for him to.
He made it seem like killing herself and making a deal with him was her ONLY option.
This is a love story, this a horror story.
This plot twist is so insane and so subtle most people didn't notice it. I am in complete awe of your sheer talent.