Lots of spiral imagery in the 1st panel. (Ice cream, the cow's unihorn, the man's hair.) Also imagine squeezing ice cream right out of the udder.
It'll be trouble for the employees when they start a fight in the middle of the store. https://www.youtube.com/watch?v=OHkJxn1_zo4&feature=emb_logo
[not a spoiler] during their Final Battle years later; their armies will talk about rumor how Maou-sama and Heroine-sama once slurped ice-cream cones together while buying their very first swords....