Professor Heine sends the princes on an assignment to investigate rumors of a criminal in the palace, and the truth shocks them.

Little by little, the problem princes have been facing their flaws and learning more about themselves as Professor Heine grooms them for the throne. But when Count Rosenberg makes another appearance, they realize there's one thing they still know nothing about: the royal tutor himself...

The kingdom of Glanzreich is at the height of prosperity. The palace employs a tutor to give its princelings an exhaustive education and groom them into fit candidates for the throne, and the prestigious post of royal tutor is bestowed upon only the best and brightest teachers from throughout the kingdom. When Heine Wittgenstein arrives at Weisburg Palace to take charge of four picture-perfect princes as the new royal tutor, he quickly learns that he’ll have his work cut out for him--for looks and reputations can be most deceiving indeed. Can Heine whip them into shape?

After a series of failures, Akatsuki decides to infiltrate Akihabara to truly understand the heart of his enemy. At the same time, Arahabaki begin the next stage of their plans in hopes to regain all that is confiscated in the former exhibition hall.

Misa goes out and tries to save Hosomichi, who is currently stuck underground. Meanwhile, Arahabaki tries its best to stall for time against Yakumo's giant Garann, Banki. With both battery girls out of commission, Misa stands up to the challenge.

Hosomichi meets the new battery girl, Misa Kuroki. She is a hacker, a gamer, and a cardboard box shut-in. Misa panics and locks herself in the recharging room. The members of Arahabaki must win a game against Misa in order to regain access.

Things are settling down with the two battery girls, but Hosomichi's regret is catching up to him. He believes what they fight for may not be worth the damage they cause. Meanwhile, a strange box appears in their room...

Hosomichi and his battery girls continue to fight desperately as the Exhibition Center approaches the final defense line. Commander Balzac tries to stop them, fearing that Hosomichi will make the same mistake as he did ten years ago.

As the situation gets dire, Munakata convinces Hosomichi to betray Arahabaki and steal the Garanndoll. Hosomichi leaves behind three angry battery girls. Just in case, Tanaka and the rest of Arahabaki prepare a new battery for their pilot's return.

Akatsuki believes he has seen the true face of Arahabaki and finally decides to end things once and for all. Arahabaki must decide their plan of action before the True Army launches their attack. However, Hosomichi continues to hold doubts.

After a series of failures, Akatsuki decides to infiltrate Akihabara to truly understand the heart of his enemy. At the same time, Arahabaki begin the next stage of their plans in hopes to regain all that is confiscated in the former exhibition hall.

Misa goes out and tries to save Hosomichi, who is currently stuck underground. Meanwhile, Arahabaki tries its best to stall for time against Yakumo's giant Garann, Banki. With both battery girls out of commission, Misa stands up to the challenge.

Hosomichi meets the new battery girl, Misa Kuroki. She is a hacker, a gamer, and a cardboard box shut-in. Misa panics and locks herself in the recharging room. The members of Arahabaki must win a game against Misa in order to regain access.

Things are settling down with the two battery girls, but Hosomichi's regret is catching up to him. He believes what they fight for may not be worth the damage they cause. Meanwhile, a strange box appears in their room...

Hosomichi and his battery girls continue to fight desperately as the Exhibition Center approaches the final defense line. Commander Balzac tries to stop them, fearing that Hosomichi will make the same mistake as he did ten years ago.

As the situation gets dire, Munakata convinces Hosomichi to betray Arahabaki and steal the Garanndoll. Hosomichi leaves behind three angry battery girls. Just in case, Tanaka and the rest of Arahabaki prepare a new battery for their pilot's return.

Akatsuki believes he has seen the true face of Arahabaki and finally decides to end things once and for all. Arahabaki must decide their plan of action before the True Army launches their attack. However, Hosomichi continues to hold doubts.

It's all led to this; will the boys finally be able to return to their old life at the high school, or will they be forced to leave it forever?

With just one day left to prove their innocence, the boys amass all their resources to launch one final counterattack against the Underground Student Council.

The boys seem utterly doomed as their expulsion creeps closer and closer. However, rays of hope shine upon them from unexpected places.