Why didn't I get chocolate yesterday?

Flan-chan said her big sister offered her, yesterday

Well, Koishi

In the palace of earth spirits Valentine day is today, that's why you didn't get anything

Why is it today?

Because the chocolate left today are the leftovers from yesterday, that's why they're cheaper

Come on, let's go buy some that you like

As expected of onee-chan

You're stingy