Taiya makes a special delivery to an old friend who inspired him to become a deliverer in the first place. Meanwhile, Cannonborg, another team captain arrives to assist the Sunseaters in taking over Earth.

Cannonborg completes his secret weapon, Boonboom Killer Robo whose powers leaves the Boonboomgers apathetic. Afterwards, Genba approaches the Sunseaters and offers to work for them with unknown intentions.