Wow, solid start with good pacing.
My heart dropped when not only his sister died, but he got the notice about his parents, even knowing it's an isekai.
I started thinking the guy would just off himself right then and there, but it got worse, turning into a trauma for life (and afterlife), but it also shows his good character that he didn't lash out at others, and clearly treated other people courteously, even while not opening up to them, evidenced by his co-workers elaborated the whole scheme to (they thought so) help him find happiness.
I also like the blurring of others faces, not only does it reinforce how they were pieces of shit on their treatment of the kids (even when parents flirting with each other is a good signal normally), but more importantly, it was a good visualization of his trauma.
I'm thoroughly invested. Hope the quality holds.