"This should be enough." I inserted the magic stone into the core of my magic wand and cast the magic. "Magic Circles 7, 8, 9, open!"

My magic wand transferred the enormous surge of mana from the magic stone to the circles I had activated. All three of them were recharged in an instant, shooting out magic chains that began to cover the turtle's whole body.

"How, how did you-!" William and the magicians were surprised and stopped attacking, staring blankly at the magic chains that moved according to my will.

A magic circle basically worked like a program. Because these had been created hastily to deal with the great demon, their encryption was awful and it wasn’t difficult to gain control of them. So, the real reason for William and the magicians’ surprise was probably that, according to common sense, it was impossible to provide energy to all of those huge magic circles at once.

Sometimes, however, common sense could easily betray those who blindly believed in it.

"Kaoooo!” As it was tied up again, the turtle began to wail and struggle.

Hearing the cries of the great demon, William regained his senses and began to blindly fire ice magic toward the turtle's head, yelling,...