Mihama Academy - on the surface, a closed learning environment established to nurture students who find themselves at odds with the world around them; in actuality, an orchard-cum-prison built to preserve fruit that has fallen too far from its tree.

Yuuma is a second year student at a school known for offering a fulfilling school life, but he has yet to experience love and spends his days lacking any satisfaction. He volunteered to lead the school cafeteria improvement committee. His surroundings became a lot more lively and before long, his first love had blossomed.

A long time ago, unknown beings known as Kotona invaded Earth in search of food. Humans were unable to repel them until some people gained special abilities known as douryoku which allowed them to exterminate the Kotona. Now, Seiichi attends Kashinomori Academy which trains people with douryoku in preparation for another attack.