Parts

Marisa borrowed a catalog about Kappas' weapons from Nitori.

Let's see if I can summon this thing called a water bomb with magic.

Marisa, you idiot. Haven't you considered that it might explode?

Don't worry. You know complex instruments tend to stop functioning by just lacking a single part, right?

So just in case, I used less magic power to summon it with one of the parts missing.

See?

Water Bomb