Right before summer vacation, classmates Sana, Momo, and Muuko talked for the first time. With just one coin in hand (500 yen), the three tired from school girls found the world's most delicious drink: "Cream Soda". This is a precious time they don't want to forget. How can they make sure to remember it? Photos, videos, and 140 characters loosen in SNS seem somewhat wrong. With plus 200 yen, a 17-year-old can extend it a little, in this summer, after school.