One day, four AUs suddenly merged into one.

The four AUs were simply spending a peaceful afternoon. But then, suddenly—

The sky split open. No, the word 'torn' was more accurate. Four cracks opened simultaneously across the red sky of Hell, and each world began to pour into the others.

Sans AU, Hazbin Hotel AU, The Freak Circus AU, and the Mairimashita! Iruma-kun AU—a total of four universes. They were meeting for the first time, and the situation was incredibly strange. After all, they each came from different worlds.

And that fact was soon enough to trigger their defensive instincts.

Friendly gazes were faint and few, almost non-existent. It was only natural. With different appearances and people they had never seen before standing right in front of them, it would be difficult for anyone to look upon the others with kindness.