Ten years ago, the major earth-shaking 'First Summer of Love' event occurred. Renton, who lost his father during the event, now attends the army school of the United Federation of Predgio Towers located in the border town of Bellforest. Because his late father is still praised, Renton feels something is lacking as he continues with his ordinary, boring days.Then one day, Nirvash, the world's oldest LFO, appears in front of him and a girl named Eureka emerges from the cockpit. This was the beginning of the future of humans and Scub Coral, another intelligent lifeform.