This is a drill.

That's those things that show up in Japanese and math homework.

It feels really good, but it's a problem because I come too quickly.

It's a tool for opening up or digging holes. The drill that Mikura is talking about is a group of questions designed to drive the knowledge home. The name comes from English and means practice or rote learning.

I see, so that's what it is.

So then, what was Saratoga-san talking about?

Umm...

What is the drill that Saratoga-san was talking about!?

Electric drill vibrator