Hatsukoi Shimai

From Seven Seas:
During a fateful visit to Tsunojo Girls’ School, Chika Matsusato meets the girl of her dreams–cool upperclassman Haruna Kanzaki. 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. But will Haruna share Chika’s feelings…?
“Loving Sisters” is the manga version of the serialized text story and drama CDs of the same name.