Twelve years ago, Japan was attacked by a Heterodyne, a mysterious monster that seemingly appeared out of nowhere. In response, 21st century Security built a giant robot called Dai-Guard to combat the Heterodyne, but by the time it was ready, they had disappeared again. Turned over to the company's PR division, Dai-Guard has since become little more than a tourist attraction. However, when the Heterodyne reappear, PR Division worker Akagi Shunsuke is insistent that he and his co-workers should pilot the robot for the purpose it was meant for.

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. As if dealing with army and company politics wasn't enough, the situation only gets worse when the Heterodyne resurfaces for a second attack.

The fighting may be over, but the paperwork is just beginning, as damage claims and lawsuits related to Dai-Guard's last mission start piling up. Whilst the rest of PR Division 2 buckles down to tackling the economical fallout, Aoyama decides that he wants nothing more to do with Da-Guard, and quits his job.

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. Ordered to capture the next Heterodyne instead of destroying it, the pilots head into battle under the watchful eye of their new tactical advisor, Agent Shirota. And Ibuki especially feels she must prove her worth after her father asks her to quit.

Faced with the prospect of having to turn Dai-Guard over to the army, Akagi becomes determined not to make a single mistake.

News of the rebuilding of the old park sparks Ibuki's old memories of playing there with her father.

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. But events only take a turn for the worse when the Heterodyne activates and starts creating smaller mushrooms that destroy the surrounding city.

It's a day free from Heterodynes, but certainly not free from tension.

Dai-Guard finds itself in trouble when a balloon type Heterodyne shows up.

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. Determined to prove that their robot is still the best, the Dai-Guard team agree to compete against Kokubogar in a kind of "Giant Robot Challenge".

With Akagi in hospital, Dai-Guard is out of action, and the army are only too happy to send out Kokubogar to fight Heterodynes in its place.

The two Heterodynes that attacked Tokyo have merged into one, with Kokubogar and its main pilot Iizuka trapped inside! Whilst the others search for the now missing Akagi, Shirota takes on the role of main pilot, and plans a joint operation with the army to contain the Heterodyne until Domeki's latest weapon can arrive to finish it off and save Iizuka.

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. Still, there's little time for bitterness when the office Christmas party is only a few hours away.

It's Episode 14, and in good anime tradition, that means it's time for a clip show. Chief Oosugi prepares a report on Dai-Guard, including details on all the team and their exploits to date.

A new year has brought big changes for the company, with Director Nishijima stepping up to take over as company president following his orchestration of Ookouchi's dismissal. In the wake of this development, PR Division 2 receives a new tactical aide- Saeki, a former student of Shirota.

PR Division 2 is to be dissolved in favour of a new Dai-Guard Enterprise Unit, complete with new Dai-Guard pilots and Saeki as tactical advisor.

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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. Meanwhile, Ookouchi and Shirota must work to get vital legislation changed that will give the army so that the army and the Self Defence force can respond to the next Heterodyne attack whilst Dai-Guard is at the festival.

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. Not only is the Self Defence Force unable to join in the battle until the appropriate legislation has passed, but Akagi's new friend Ishihara has stolen his Dai-Guard access card! Still the team cannot stand idly by, and it falls to Aoyama to convince Arisa, an old friend from university, to help them find a way to lure the Heterodyne to Dai-Guard.

It is the thirteenth anniversary of the day the Heterodyne first appeared- the day Ibuki's father died. Ibuki has always based her strength and purpose on the belief that her father was a hero who tried to warn everyone that the Heterodyne were coming, but are her memories real, or just wishful thinking? Domeki suspects the latter, and her revelation that the truth about Ibuki's father is far less glorious may be more than the young Dai-Guard pilot can take.

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. Now, as Ibuki takes a vacation whilst she decides whether or not to pilot Dai-Guard ever again, the team must put up with Matsutouya, her manual-obsessed replacement.

A day with zero probability of a Heterodyne appearance gives the team the perfect opportunity to pursue other interests and tie up a few loose ends. Whilst Ibuki and Aoyama visit their parents, poor Akagi is nominated to make a speech at the spring hiring ceremony. Meanwhile, Irie and Nakahara decide to interview their co-workers in an attempt to create a film about the heart and soul of the Dai-Guard team.

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! Desperate to clean up the mess they made, the army begins considering bombing it with destructive OE weapons, despite the fact that this will vaporise much of Tokyo as well! Determined to avoid this, the Dai-Guard team begins searching for an alternative solution, but even if they can find one, will the army be willing to lose facing by letting them help?

Five thousand metres above ground, Dai-Guard and Kokubogar must brave the perils of the Heterodyne's body in search of the original fractal knot. But even as they battle their way through the numerous obstacles in front of them, the clock is ticking- in less than two hours, the army are going to launch a destructive OE that will take down not only the Heterodyne, but vaporise all of Tokyo as well! Will the two giant robots be able to pull off a victory in time?