Fumi and Akira were best friends when they were little, with Akira always looking after the crybaby Fumi, but that all ended when Fumi's family moved away. Several years later, Fumi's family returned, and she and Akira happened to bump into each other on their way to school. They became friends again, quickly slipping back into old patterns. Shortly after, Fumi began dating a cool, attractive upperclassman who, coincidentally enough, had ties to Akira's current school, the prestigious Fujigaya Girls' Academy.

The first volume of Aoi Hana was published digitally in English as Sweet Blue Flowers by Digital Manga Publishing under the Digital Manga Guild imprint on April 2, 2014. VIZ Media picked up the license and released the series under its VIZ Signature imprint as four 2-in-1 omnibus volumes from September 19, 2017, to June 19, 2018. It was also published in Spanish by Milky Way Ediciones from October 20, 2015, to December 19, 2016.