Classroom of the Elite

What people commonly call fate is mostly their own stupidity.

With the panty thief incident already eroding Class D's trust, the decision is made to separate the boys and girls camps. That night, while sitting together by a campfire, Ayanokoji notices that Horikita is sick, and has been concealing the fact since the start of the test. The situation continues to turn for the worse, as Horikita finds her leader key card stolen, and during the ensuing chaos, an unknown arsonist sets fire to vital resources.