Ryouki no Ori Dai 4 Shou

After joining the manga research club with impure motives due to its female members the protagonist is now convinced to accept a job as a volunteer security staff at a manga convention that is said to receive 500.000 people over 5 days.

But trouble starts happening. A fire is started at a stand, a threatning letter is delivered to stop the event and then things start to escalate...