Right before the battle, Suzaku calls him from Euphemia's phone.
He is going to abandon playing by the rules and fight out of hatred now.
Lelouch tells him that he should, despite knowing he'll be the target.
Then the battle begins.
Zero pulls rank of the remaining heads of Kyoto; they work for him now.
He declares the independent nation: The United States of Japan.
He makes an immediate move to attack the Britannian city at Tokyo with all the forces he can muster.
Zero shoots Euphemia himself.
Suzaku pulls her out of battle in hope of saving her, but she only gets a short amount of time.
Just enough to make it clear that she doesn't remember what happened and would never have endorsed it.
Lelouch's example becomes an order, and Euphemia opens fire into the crowd, then order her soldiers to as well.
The opening of the Special Administrative Zone becomes a lie and a massacre.
Zero orders the Black Knights to fight. Only he and C.C. know that this was a mistake.
Meanwhile, Suzaku detects C.C. in attendance. He goes to ask her something, but as he touches her, there is some kind of flux in the power of geass, knocking him out and causing C.C.'s geass mark to flare.
And pushing Lelouch's geass out of control, so that it it always on.
Zero talks with Euphemia, asking her to shoot him and make him a martyr. She refuses and he agrees to go along with her plan.
She finds it hilarious that he thought she would shoot him on request.
He can compel obedience, he explains. He could tell her to kill all the Japanese.
Within the district, the Japanese and Britannians will have equal rights.
This cuts Zero's legs out from under him; if he supports it, he has to give up on violence. If he opposes it, he'll lose his popular support.
Lelouch has a school festival to run and a coup d'etat to organize.
Euphemia attends in disguise. When she's revealed, she takes advantage of the press attention to announce the Special Administrative District of Japan.
Suzaku is sent to fight the JGIE in Kyushu, but he is cornered and running low on power.
Euphemia calls him to make a love confession, but he's doomed.
Until Zero and C.C. show up in Gawain (their stolen experimental Knightmare.) With a spare battery.
They take out the JGIE.
Suzaku resigns as Euphemia's Knight, feeling himself unworthy.
A group calling itself The Japanese Government In Exile, backed by The Chinese Federation, attacks and conquers Kyushu.
Zero rejects their claim and suggests that the Black Knights declare Tokyo independent.
Zero and Kallen steal a prototype flying Knightmare and escape.
Suzaku is arrested for mutiny. Lelouch had used his geass on him to force him to choose to live rather than throw his life away.
It's possible that Britannia's wars of conquest are actually to capture these artifacts.
Meanwhile, Euphemia has figured out that Zero is Lelouch. The four lost people reconvene and are brought to Prince Schneizel by accidentally activating the artifact.
Something happens off screen that leads to Suzaku, Kallen, Zero, and Euphemia being relocated to an isolated island.
Prince Schneizel leads a mission to that island, but not to rescue them.
A mysterious artifact known as a thought elevator is located there.
Zero tries to capture Lancelot and turn Suzaku. But he cannot be swayed.
Higher-ups order Suzaku to hold Zero in place and launch missiles. His sacrifice will be in all the history books etc.
Kallen face-reveals to try and convince him to stand down.
Colonel Tohdoh, the last leader of the JLF is scheduled to be executed. Zero springs him. But when Lancelot interferes, his cockpit is broken open, revealing Suzaku as the pilot to everyone.
Lelouch feels betrayed. Euphemia picks him to be her Knight Champion.
Have I mentioned that Suzaku's father was the former Prime Minister of Japan before Britannia invaded?
It turns out his "suicide" was actually a coverup for a young Suzaku killing him.
This is why Suzaku is so reckless in battle; he's suicidal.
Lelouch learns the difference between "shoot him" and "kill him" when Mao turns out to be less dead than advertised. He kidnaps Nunnaly to force Lelouch into a confrontation.
Suzaku has his back and helps rescue Nunnaly, but Mao reveals his dark secret: he killed his own father.