Against the wishes of both the Army and 21st Century Security, Akagi and the rest of PR Division decide to help those hurt in the Heterodyne attack by flying them to a hospital.
With rumors flying around about a new division being created to take charge of Dai-Guard, the team decides to demonstrate that they are the best people for the job.
News of the rebuilding of the old park sparks Ibuki's old memories of playing there with her father. Is this just a long flashback, or will her recollections come in handy in the battle against the latest Heterodyne?
Things get boring for the team when they are forced to go on standby for a week after a mushroom-shaped Heterodyne with regenerating abilities appears.
With Shirota's help, the army has built Kokubogar- a brand new giant robot that they hope will replace Dai-Guard and end the days of civilians saving the world.
With Kokubogar needing serious repairs, Shirota resumes his previous assignment as Dai-Guard's tactical advisor... although not everyone is happy to see him after his earlier betrayal.
The PR Division 2 workers may have been reassigned, but that isn't going to stop them from enjoying one last vacation together- until they discover that their rest stop is also home to a dormant Heterodyne!
When it comes to fighting the latest Heterodyne, the new Dai-Guard pilots just can't seem to cut it, so much so that their continued failures have earned Dai-Guard the moniker "loser robot"!
Nishijima may be gone, but 21st Century still has to clean up all the deals and contracts he made, including an agreement to send Dai-Guard to the Sapporo Snow Festival in Hokkaido.
Trying to fight the Heterodyne that appeared in Hokkaido has proven to be nothing but trouble, and now it looks like the team is in for more of the same.
As if learning that her father was not the hero she always believed him to be wasn't bad enough, Ibuki's will and nerve became completely shattered when she had to fight against a Heterodyne almost identical to the one that killed him.
The pattern of quakes suggests that the worst Heterodyne yet is about to appear, but when it shows up five thousand metres above Shinjuku and does nothing, no one is quite sure what to make of it.
Following an ill-advised attack by the army, the latest Heterodyne has grown to cover central Tokyo, its many strands reaching down into the earth below- and in only a month, it will have become large enough to encompass the entire world!
