Thirteen girls, each with the ability to materialize "Elements" and summon metallic guardians called "Childs" have been brought to Fuuka Academy to battle mysterious creatures called Orphans. Each with a different personality and background, they must decide who they truly care about and why they fight.

Yui Yamada, a high school girl with a fondness for plants and gardening, starts dating Tomoka Kase, the ace of her school's track team. Yui is shy, girly, and has never been in a relationship. On the other hand, Tomoka is vivacious, tomboyish, and popular among her friends. Despite being different in so many ways, they try to understand and support each other while experiencing the rush of exhilaration that accompanies the magic of first love. Asagao to Kase-san is a heartwarming tale of two girls dealing with their ever-increasing feelings for each other along with other concerns that plague the hearts of maidens in love. [Written by MAL Rewrite]

Somewhere in the school at noon, one might hear the sound of two girls playing table tennis together as they wait for time to pass by. As if by fate, two students—Sakura Adachi and Hougetsu Shimamura—stumble upon each other on the second floor of the school gymnasium. As they gradually foster a budding friendship, their feelings for one another only become more ambiguous. Growing closer by the day, the two must learn to navigate their contrasting personalities as well as determine the depth of their affection for each other. The nature of this relationship gradually shifts when one of them starts to develop feelings beyond the boundaries of a platonic relationship. Even so, Adachi and Shimamura must realize if forming a bond stronger than friendship will bring them closer or tear them apart. [Written by MAL Rewrite]