During a visit to Tsunojo Girls' Academy, Chika Matsuzato meets the girl of her dreams, cool upperclassman Haruna Kizaki. Even though they spent only one short day together, Chika will never forget Haruna's kindness, and has made it her life's goal to study hard and get accepted into Tsunojo Girls' School so that they can be together. However, things do not go as smoothly as Chika had planned when she finally arrives.