Haruki and Motoki are high school third graders. She was pursuing the student council vice-president Chisato's sexual propensity in the spring break assignment "People Document Thesis." At that time, you can see a woman selling a lactobacillus drink "Jokul" at the bus stop. The two are interested in the woman who is wearing uniforms and nailing the salaried workers' eyes. They changed the target from Chisato to a lactic acid bacterium drink saleswoman and started tailing.