That night.
Yukimura Suzune sat reading, but her eyes kept drifting to her phone. Chikage had said he would call that evening with an answer to her confession.
Because of that, she could hardly focus on her book. She closed it with a sigh, then grew more flustered the longer she thought about it.
"How long is that guy going to keep me waiting?"
Just as she began to feel a little resentful toward Natsume Chikage, she heard a noise behind her.
Clang.
She immediately turned around.
A strange key had appeared on the floor, giving off an odd glow. She froze.
"What is this? How did it get into my room? And why is it glowing?"
Suzune narrowed her eyes and picked up the key with a wary, puzzled look. The moment she did—
A vortex appeared in the full-length mirror before her. A keyhole formed within it, drawing her gaze. The sudden, surreal sight left Suzune stunned. She had always believed in material explanations, but now that belief was beginning to crumble. "Wh-what is this? Why is it in my room?"
Suzune grew cautious and stood before the mirror, trying to work out what she was seeing. Then the vortex shifted. In the mirror appeared the house she had seen in her dream. To her astonishment, Fujiwara Aoi, Saionji Nanase, and Akita Sana were already inside.
"Why are they in there?"
"Nanase! Aoi! Sana!"
She called their names, but the three of them seemed unable to hear her. They only looked around in confusion and surprise, apparently talking among themselves. After a moment's hesitation, Suzune looked down at the key in her hand, then up at the keyhole.
"Could this key... let me go inside?"
She slipped the key into the mirror's keyhole and gave it a slight