Sakuramoria

- Maybe if they left of their own free will, we don't really need to investigate anything? - Duke unexpectedly suggested.

— Considering that Yukka, Stella, and Jin left with them, and since their return, they have tended, let's say, to be a bit out of touch, one could argue how "willingly" at least this trio left. Furthermore, as Varya already pointed out, the timing is suspiciously coincidental. Those who left may, due to their own naivety and ignorance, find themselves in danger. If the same people behind the attack are behind their disappearance, they could easily brainwash them and then send them back here as sleeper agents. The results, in this case, could be even worse than with Dion. So, let's first try to find them, and if they really want to leave, I'm sure Futaba will allow them to do so according to the rules, and not secretly.