It's been four months now since Serina and Mizukawa-sempai started going out. The second semester kicks off with a schoolwide festival, and Serina realizes something-Mizukawa-sempai's popular with the girls. But before she can come to terms with this revelation, she meets Higuchi-sempai, the hottest boy at school-and he seems to have a thing for her! She's living the high school love story of her dreams, and every day-no, every second-her heart races a little faster!