At Aibo Academy Elementary Division, Gao Mikado, a seasoned 6th-year student, unites with the formidable Bal Dragon, hatched from a mysterious egg. Together, they aspire to claim the title of the world's mightiest fighter by competing in the prestigious 'World Buddy Cup'. Engaging in the thrilling card game Buddyfight, where monsters serve as human companions, Gao and Bal face off against formidable opponents like the ex-Buddy Police member Tasuku Ryuenji and the formidable duo Gaito Kurouzu and his companion monster, Abygale, known as the strongest pair in the game.