Gao, Roars!.On Earth, Tasuku Ryuenji, a young prodigy member of the Buddy Police, busts a fugitive in a Buddyfight as Gao Mikado watches the scene unfold on TV. On his way home, Gao, assuming the name "Mighty Sun Fighter", saves a boy from a group of bullies using his Aiki-jūjutsu skills and returns home only to be scolded by his mother Suzumi. The next day, Gao goes to school, Aibo Academy, and meets up with his classmates: Kuguru Uki, Baku Omori, and Noboru Kodo. In class, he and his classmates open booster packs of Future Card Buddyfight when Gao suddenly pulls a Buddy Rare card, which summons Drum Bunker Dragon Fang Slade Terrestrial the 13th from the Dragon World. Drum's appearance means that Gao is to become buddies with him, although Drum is reluctant after having monitored Gao's actions from the Dragon World up to his point. Then, Tasuku and his buddy Jackknife Dragon arrive, and Tasuku gives Gao a Core Deck Case in recognition of him becoming buddies with a monster, officially making Gao a Buddyfighter. Tasuku takes his leave until Gao decides to challenge him to a Buddyfight.