Kirisame Marisa and the Laughing God * by Rioshi

Uum...

What's the difference between...

...ice cream and old fashioned icecream? アイスクリン (aisukurin)- old fashioned icecream, naming comes from Meiji period (1868-1912). Also a brand name.
アイスクリーム (aisukuriimu) - ordinary ice cream. Major difference is that old one usually had for about 3% of butterfat, modern holds more than 10%. Wordplay is on similar sounding.

You're the only one in the world, who wonders about that!

Eeh-? Whaaa-...?