Schrödinger's Cat. Is the cat in the box alive or dead? You won't know until you open the box.

That's why you surely closed the lid that day.

The day you snapped the neck of your pet cat, 'Ririko,' you left the emotions swirling inside you to die.

It was a rainy day. That day.

You were on your way home.

Then, in the park, a woman with long black hair was lying there.

You must have caught your breath.

______Ririko has come back.

You brought that woman home. You could have called the police. But the 'monster' inside you would never have allowed it.

That 'sadism' you surely locked away. Even though it surely died, it flashes through your mind every time you look at Ririko.

_____I want to kill you.

This is a story of two people who keep a sad monster inside them.

• Guest's background is quite firmly established.