One peaceful day, the sky was suddenly covered with darkness.

After that, a monster called Shadow appeared and began attacking the inhabitants of this land.

To combat this, the survived people attempt to build a signal tower to restore light, but even this fails due to the interference of the Shadows.

This story is about Demon Slayer, a universe that got teleported after the signal tower was taken over.

After they arrived to the signal tower again, some of Demon Slayer characters, like Zenitsu, are in panic, but most of them are trying to do things to help, exploring or wondering what happened in this universe. But some of them, like Kaigaku, are chased by Shadows, because they didn't heared anyone's words.

Mission 1 : Fill the signal tower's fuel to 100% Mission 2 : Upgrade the tower to level 2