Kimi wa Maru de, Ano Hana no You de.

On the day of the junior high entrance ceremony, Hinagata Nazuna fell in love with a second year student, Ichikawa Nao. Unfortunately, her love was short-lived as she discovered that he already had a girlfriend, the basketball club manager. As time passes, Nazuna decides to let go of her unrequited love for him and aims to find a new love interest. However, on the first day of her high school entrance ceremony she unexpectedly comes face to face with the boy who broke her heart years ago…
(Source: Day of the River)
Includes oneshots: Ai wa Ai yori Aoku (愛は藍より青く), Kaze ja Nakute Kimu ga ne (風じゃなくて君がね)