BBK/BRNK Season 1 Episode 21
Swan Song
After rescuing Reoko from Guy's island fortress, Azuma and the others rest of the Japanese crew flies back to Japan... but the moment they're over Japanese waters, a flying craft approaches at high speed. From the heart waveform, Matobai determines that it's Mega-lala. Azuma leaps out to the hull of their flying boat to face the Buranki, and a battle between two heart users who could have been great friends if not for the involvement of Bubuki and Buranki begins.