From Naono Holics:

"Please bury me," the boy said before their eyes even met, and ever since then, he has been seeing that boy everywhere - on the way to work, at the restaurant, at home - asking if he would bury him.

He is afraid. He is terrified. But not because there's clearly something wrong with all of this.

It's because he remembers.

He knows there's a reason the boy is asking him this. There's nothing strange about it.

"Please, bury me?" the boy asks again.