Which one? If it's this gang rape hide and seek thing, that's not on Karino since he's actually trying to keep Azusa out of it while still pretending to play along with Eno.
Not that, like how he keeps forcing himself upon azusa , ignoring his feelings, and constantly ignoring him. on that day of the “hunt” as well he clearly could’ve told azusa not to come to school or when he hid him he could’ve at least told him what was going to happen. honestly i just believe if karino truly loved azusa he could let him trust him. they’re whole relationship is just one huge mess tbh.
Personally, I think they only realized they may be falling in love during the field trip. For Karino, it's always been about power and trying to break Azusa's will and for Azusa. I think people who are expecting a canon lovey dovey ending will be disappointed. Like, I have no doubt they will end up together, but it's essentially going to be two broken people who can't live without the other anymore.
Also, about the hunt: it wouldn't have mattered if Azusa didn't show up that day, Eno would have probably moved it to when he does go to school. Karino couldn't really explain too much over the phone since Eno was monitoring him pretty closely. I'm actually pretty annoyed with everyone else who was trying to help since they were with him longer and in person and could have explained better. Although, given what we saw and know of Azusa, even if had known the situation fully it wouldn't have mattered since he's too stubborn and proud to sit tight and do as he's told. Essentially, the only way he could have avoided it would have been to drop out of school (as was what he was already contemplating), but Atsumu just had to conveniently convince him back
i honestly hope that karino and azusa dont end up together at all, especially after all that had happened. even if karino truly loves asuza, WHY DOES HE KEEP PUTTING HIM IN ALL THESE HORRIBLE SITUATIONS?!