A café run by her grandfather. News of his sudden death reaches her. In his will, her grandfather entrusts the café to her care. The place has a mystical air, and it is there she meets a group of mysterious visitors.
 

“As you can see…we are guests from another world.”
 

He proclaims with a smile: “I’m the ‘Demon King’.”

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Is this encounter merely coincidence?

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Or is it fate?

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What story awaits her beyond this strange encounter with these supernatural beings?