Novel's Demon ND

I've died.

However, it wasn't the end.

Somehow... I woke up once again though not in the world I knew but in a world of a fantasy novel I've read in my first life.

Unfortunately, I wasn't reborn as a Main Character, a supporting character or even an Extra...

No!

I reincarnated as a weak and useless Demon. However, this was not even the worst part...

'Why the fuck am I stuck in the Academy!?'