Sonic Channel staff on their blog:
It is Cream and Cheese!
This time, the people who answered only “Cream” were also correct.
The calendar’s image is the Hinamatsuri of Cream and Cheese. ♥
Among the three keywords—“Cream,” “Cheese,” and “Hinamatsuri (related words)”—14% of people hit only one of them, 45% hit two of them, and 34% hit all of them!
The close friends Cream and Cheese are always together, so all of you please remember, all right!?