However, if Fitts-senpai who is one with proven real ability does it, it's this much.
I don't know what kind of magic circles Nanahoshi is drawing, but I guess that means that summoning magic uses up that idiotic of an amount of magic power.
Unlike attack magic, it doesn't seem to be something that can be used a number of times in battle, so it's not strange for it to be few times.
However, even the scrolls that ends up clearly being failures cause Fitts-senpai's magic power to be exhausted.
No, precisely because we're trying to summon from another world should be why it consumes that much magic power.