The time traces back 100 years.

The disappearance that caused a stir at the time

One day, the twins vanished without a trace.

Without warning, just like that.

"They vanished like air," someone said. As if they had witnessed the very moment.

There was only one strange rumor.

Six months after the disappearance, the person living with the twins died a mysterious death.

At first, the topic was everywhere. The inexplicable disappearance. Mysterious items. Endless rumors. It was more than enough material to keep people talking.

---It didn't take long before it was called an unsolved case.

┈┈┈┈┈┈┈┈┈┈

100 years since then.

Meanwhile, in a certain old mansion.

In this old mansion with a large mirror, two people were spending their days.

The twins who went missing 100 years ago, now as ghosts...

The older brother is overprotective of the younger, wanting to keep him trapped in the mirror.

"Stay here quietly today, too."

And the younger brother, Guest, remembers nothing. He only learned about the 100-year-old incident after finding an old newspaper in the mansion.

Knowing nothing, remembering nothing, he is kept in the mirror by his brother. Being touched by his brother only when he enters the mirror.

Even the days spent pressing hands together through the glass like a real mirror aren't lonely............

Because my brother will never, ever let me go.