[What little Diluc knows is from Barok, not Kazuma. It was offered as an explanation for why Kazuma had allowed his emotions to cause him to become overwhelmed with nightmare energy when they both arrived in Songerein back in the fall. Despite his interest, he has declined to bring it up with either of them in search of more details. He knows from his own experience how raw and terrible feelings on both sides must be, and relates with each of them too strongly to betray that understanding in the name of his own curiosity.

Similarly, he more or less is content to drop the subject with Susato after she's more or less confirmed his question.]

It's good of your father to have done that. My own father took a boy in when I was a child, and he and I were inseparable for our entire childhoods.

[Up until his father died and some dark truths came out. But that's a story that he has no intentions of getting into. Besides, there's something about the way she keeps glancing back at Kazuma that makes him think the situations aren't all that comparable.

While he notices her place the bag onto the counter as she settles in, he pays it no mind. Something that resembles a purse from her world, perhaps, or a gift for the business owner that she actually knows.]