Silver Door Diner by Bishop Garrison

Silver Door Diner by Bishop Garrison (FIYAH #16, Autumn 2020) opens with an unaccompanied young boy going into a diner. Tammy the waitress offers him some apple pie if she’ll tell him who he is and who looks after him. He replies that he is on his own, and then she gets ever more enigmatic answers to further questions, including the fact he is studying “how this world ended”. Then, when Tammy asks the boy what game he is playing, he tells her this:

“Susan Culpepper. Eighth grade. In the lunchroom. You made fun of her clothes in front of a group of girls. You said she looked poor and homeless. All of you laughed. At the end of lunch before class, you were in a restroom stall and saw her come in crying. She sobbed for a solid two minutes. Then she left. You wanted to apologize and didn’t. The next week she transferred schools. You never hung around that group of girls again, and to this day you regret never telling her you were sorry. You looked her up on social media more than a dozen times.”
Tammy’s eyes are the size of the saucers sitting behind her on the counter. “I—I never told anymore that story.”
“You told it to me. Susan is married now with two children in a lovely brownstone in Flatbush, Brooklyn. She’s a wealthy author married to an anesthesiologist. Funny how life works. Writing about the abject poverty she survived as a child made her a millionaire. This world loves its irony nearly as much as it does its war.”

The rest of the story details Tammy’s reaction to the above, further personal information about her (apparently the man who comes into the diner every day is secretly in love), and (spoiler) that the boy is an alien being from far, far away.
We finally learn that Earth will be destroyed the next day by two mad dictators, one of whom will fire a burrowing thermonuclear device which will fall into the ocean and tunnel into the Earth’s crust, destroying the planet. This will cause a rift in space-time that creates a thirty-six hour time loop, which the alien/boy will then repeatedly use to visit Earth before its destruction so that it can study humanity. The story closes with the alien saying that this will be its last trip, and Tammy responds (uniquely) by going to track down the man who is in love with her.
This has an intriguing first half, but the more that is revealed the less engaging it becomes. Not bad overall, though.
*** (Good). 4,700 words. Story link.