This is the destined battle that befalls high school girl "Ichikawa Aoi" and her best friend "Funabashi Satomi," who attend "Nijiyome Academy"... The mysterious substance "SEED" that fell to Earth from space, once fused with Earth's lifeforms, grants the host explosive energy. However, when fused with Earth's animals (including humans), it also transforms the host into a monster with ferocious abilities, which is terrifying. SEED was precisely the subject of Satomi's late father's research. Inheriting her father's research of "using SEED to consolidate peace," Satomi constantly finds herself in dangerous situations. All of this is orchestrated by a mysterious figure who calls himself "SEED SATAN," aiming to monopolize all the secrets of SEED and conquer the world. To protect her best friend Satomi, the protagonist Aoi offers herself to fuse with SEED, transforming into a super warrior to battle SATAN. Moreover, allies who extend their hands to help them also gather (calling themselves the "Disciplinary Committee"), and beneath the peaceful academy, a battle that determines the fate of Earth thus begins.