If i don't rmmbr wrong (since i also read the raws too) there's a guy who did a spoiler dump here in one of the older chaps, you can relate to that post for answersi thought it was arisu or shiki at first (was afraid but I thought they were too important to just get killed first)… but man a kawaii girl still died
By the way, does anybody know if they will move from orcs and start attacking other monsters?the other manga (side story of this) showed that there are dragons beyond the hill the school got relocated to