Gungnir's getting a real workout on this trip.

Katsuraham sure sounds great for those who loves colorful rocks and a statue of a revolutionary leader.

It must be hard for Gungnir on this trip. Don't worry, you can do it!

Remilia can't take a joke.

Five Magic Stones?

Also, those apparently are a famous souvenir.

Dont worry Kogasa, There's still round two and you have a full set of spellcards to use!

Remi should use a different ability in owning Kogasa before Gungnir breaks or something from being over used... that or just give kogasa a break.

I like shiney rocks and I can not lie. Serioulsy I do. Especially really smooth ones.

Given the title, I'm guessing Katsurahama just doesn't have much of anything in the way of unique souvenirs. Remilia seems to be cursed with vacation misfortune. (Recoil/backlash from reweaving others' fates?)

According to this link given on the Pixiv page, they're considered a genuine souvenir, all right, or at least something considered specific to the area. (Mizuki says tidal changes are causing the number of such stones to decrease gradually, though.)

The stones are:
Red: Mostly reddened basalt/whinstone
Gray: Sandstone
Green: Tuff (consolidated volcanic ash)
White: Cloudy chert
Black: Black shale

They become rounded as they're washed down the rivers to the shore, thus becoming the stones as seen here.

cybeast said:
It must be hard for Gungnir on this trip. Don't worry, you can do it!

Hang in there, Gugnir-san!