Eddie Templer is labeled as an E-Rank outcast in the Hero Academy. Betrayed by his girlfriend Zora Lytton and framed by the wealthy heir Santos Yard, his life hangs by a thread. In his darkest moment, Eddie awakens the formidable SSS-Rank Hero System. By defeating mythical beasts, he accumulates energy to summon legendary heroes. With each victory, his summoned warriors grow stronger, capable of fusion and limitless power. Eddie's journey from underdog to unbeatable hero begins.