Since I Didn't Make the Cut, I Might as Well Do Whatever

After failing the entrance exam, the penniless protagonist

stumbles into a mysterious street

and buys an admission letter from a strange old man.

The bizarre letter really does send him to an equally bizarre school.

The school's credit System is a total rip-off!

With no other choice, the protagonist sets out to earn credits. But why does earning credits put his life in danger?!

Friendship, monsters, treasures, ruins, swords, and magic... The protagonist has no choice but to keep getting stronger!

Will he uncover the greatest secret of this strange school? Just wait and see!