Apparently you can make it into a rocket!

What she said.

Oh, umm...

Yup. It's summer break, after all.

A water bottle from the Outside World!

That's a rare sight, though. Marisa-chan, playing in the dirt without any of 'em bullets?

I'm teaching her! I'm tooootally her senpai when it comes to playing!

Ho ho hoo I see. Well then, senpai, what do you have for us next?

Tadaah!