Teacher? Demon King!

In a certain inner world…. 

Gray had just been chilling, waiting for a certain elf. But not only did the guy not show up, but he suddenly started spasming in the outside world? 

"Are you kidding me? This guy can't even enter?!" 

What kind of useless elf was this?! Gray had already been ready to politely discuss the exam with the guy, but the latter hadn't even managed to make it?! 

Sera? → No issue

Proctor? → Few issues

Arrogant Elf? → Can't even enter?! 

Ah, could it be that one's ability to visit had no relation to one's power? Perhaps the only criteria was how friendly one was? Oh well, he'd have to test it later! 

Still, what was he supposed to do now? This elf sure was a HUGE pain in the ass! Then, as soon as he started coughing blood, his body started glowing all shades of red. 

Why did it remind him of an emergency alarm? 

Why did it feel like it was warning someone?

Why did it feel VERY ominous?