In the aftermath of the big battle on Treasure Island, Azuma and friends head to Taiwan. While Azuma gets stuck in customs, the rest of the crew encounters a new team of Bubuki users led by Azuma's long-lost sister, Kaoruko.

Her appearance raises more questions than it answers, and the biggest mystery is how she ended up controlling a black version of Oubu. It may take a while to find any answers, as the team has some more immediate problems to deal with, including a menacing new heart user and the return of the Russian Bubuki team! BBK/BRNK: The Gentle Giants of the Galaxy is an original anime work and can be found streaming on Crunchyroll, Saturdays at 10 AM EST.