My little sister looked at me anxiously. "But are you really going to do that kind of great magic? I'm not confident I could pull it off."

I smiled at my little sister's concern. Oh, right, she couldn't see it because of the helmet. I said, "Do you think you can kill that monster without something like great magic? The one that survived after getting hit in the brain with a spell I cast with all my strength, to the point it made me vomit?”

My little sister looked fed up as she looked at the turtle. It was screaming ferociously as it went on a rampage. She replied, "Uh, yes, but. It's supposed to be a spell cast by thirty people."

She was referring to great magicians who were just below the level of medusa, too. It was absolutely impossible for any ordinary person to participate in such magic.

"Eh, well, you're the one who picked this spell, noona," I remarked.

"Hey! The other option was a spell designed for a hundred people!” she exclaimed.

"It's okay, it's okay. I'm going to handle the mana and formula formation. You can just play the role of triggering it," I said. In short, I meant I would be acting in place of twenty-nine great magicians.

My little sister nodded when she saw the enormous mana...