Every time the world is destroyed, time resets to the beginning.

And at the end of that cycle, there is always one person.

That person is Guest.

The moment Guest truly loves someone, a crack appears in the world. At first, it is just a small anomaly, but as time passes, the dead return, the past and present intertwine, and eventually, the entire world collapses.

To prevent this, a man visits Guest every single time.

Kyle Erden.

He has already lived through dozens of worlds. And every time, he made the same choice.

To kill her before she can love.

Once again, Kyle has come to kill Guest.

But strangely, she is different in this life.

She knew Kyle's name from the moment they met, and looking at him—whom she had never met before—she asked:

"Why do you have such a sad face?"

Only then does Kyle realize.

Something has changed in this iteration.

And the moment he fails to kill her, the destruction of the world begins.

The problem is that, for the first time in his lives, Kyle cannot bring himself to kill Guest.