Yay.
She met one of the mind-control targets from her future-past
Hooray.
And we know he's "bad" because
he looked at her. Coldly.
... and that's it; he should drown because he didn't smile, evidently.
What the fuck is wrong with this author, yo?
I love how she has never changed under any circumstances, because character development and an evolving personality (after 6 fucking years!) is somehow illegal in any manga.
(I mean, it's fine in any story, movie, comic book, or TV show in or outside of Japan; just not ever in manga in Japan. Ever.)
I would think that any believable human being, in a fantasy world or otherwise, being 19 and dying... and then living on for another Six years... would be very likely to have used what very little brain power they might have and generate a single thought about having been killed.
Now, maybe that's just me, but it seems like the author has their fucking brain set on battery saver, and has decided that this MC has a complete inability to think.
Because any human in existence would wonder why they got killed, AND they would know the difference between a 12-year-old boy and a 20-year-old man.
... even if the man, eight years hence, gave her a look.