The Diatomite Magic Circle Bath Mat is apparently super functional — as a bath mat, not as a real summoning circle.
The bath mat is 19,800 yen, and the set of three coasters is 3,800 yen (tax excluded on both).
To celebrate, ufotable is putting out a line of home goods to make you feel like the mage you wish you could be: summoning circle bath mats and coasters.