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At last, the Robot Research Club enters the ROBO-ONE tournament; the revolutionary KILL-BALLAD control scheme makes Kaito a force to be reckoned with, but it may not be enough to win the tournament and save the club.

Subaru seeks Kaito's help for the upcoming ROBO-ONE World Championship in Las Vegas; Akiho struggles to keep the club funded while Kaito reflects on a life-changing incident.

Kaito and Junna set out to investigate the strange ghost that Kaito caught a glimpse of, but only succeed in discovering more mysteries.

Subaru and Kaito start practicing for the upcoming ROBO-ONE world tournament in Las Vegas; during his off-time, Kaito stumbles upon a mysterious room inside the abandoned folk museum.

While Kaito and friends encounter more mysterious phenomena, another solar storm suddenly hits the Earth; Akiho gets the GunBuild-1 project funded and rolling full-steam ahead.

Akiho is elated when a grown-up Nae Tennoji offers to help the Robot Research Club build a giant robot; Kaito is caught in a typhoon while searching for the elusive Kimijima Report No. 2.

Mashumairesh is back and heading to Shibu Valley to try and play at the Midi City Worldwide Love Rock Festival; they run into some trouble on the way.

The girls of Mashumairesh are put on trial for their alleged role in the destruction of Midi City; they must prove their innocence.