Battle of Kaminejima Island

Stranded
after the failed Lancelot Capture Operation Zero finds himself stranded after ordering Suzaku Kururugi to "Live On". He is on a desert paradise island with to his surprise Euphemia Li Britannia. A few minutes later she awakens and sees Zero which scares her, in a few minutes she contemplates and decides that her and "Zero" should work together.

Suzaku also finds himself on the same island however he believes he is alone and begins scouting with a gun in hand and soon afterwards finds a nude bathing Kallen Stadtfeld. She notices him in a few seconds and pulls a concealed knife that was inside what appears to be a cell phone case, however this proves useless as Suzaku subdues her by throwing her on the floor. The two can't believe they are on opposite sides have a quick talk and Suzaku arrests Kallen and goes along with standard Britannian arrest procedure.

Euphemia and Zero speak as she waits for her cloths to dry wearing Zero's cloak. Zero reveals to Euphemia that he is in fact Lelouch Vi Britannia which she does not show much suprise to.

After that it turns to night and both Suzaku and Zero have set up camp. Suzaku Tells Karen to abandon the Black Knights. He thinks it's not too late now and it'd be unfortunate if Kallen is caught as terrorist. In response Kallen reveals that she already fought against Suzaku in Knightmare frame. Suzaku finally realises that Karen is the pilot of Guren Nishiki. Because of this, he tells her that there is no future in her ways. An angry Karen responds by saying that Suzaku's future is that of a dog to the ruling establishment whose only purpose is to live. She then scoffs at his 'Honorary Britannian' and 'The Knight of the 3rd Princess' title, thinking that it insults the name of Genbu Kururugi.

The Search
Meanwhile the next day, the Britannian Airship Avalon starts a search and finds a temple which Schneizel El Britannia orders his men to excavate this is due to  Schneizel revealing that his father has obsession with this kind of thing. Rakshata also starts a search with the Black Knights to find Zero in his submarine headquarters. Sonar picks up an island which they stay in the vicinity of. Euphemia and Zero begin exploring the island for food ,shelter and anything else, Suzaku also starts a search and they both run into each other Kallen is over joyed to find Zero is on the island and Euphemia (who has romantic feelings for Suzaku) is also very happy to see him.

Escape
Suzaku and Zero get into a struggle. Suddenly the ground beneath them lights up, revealing a large Geass sigil. The four of them immediately transported into the underground dig site. Seeing that they are surrounded, Zero takes the initiative to steal the Gawain to get himself and Karen out. Thanks to its cannon and flying ability, they manage to get out safely and destroy any Knightmare frame resistance. Landing in his sub the Black Knights retreat.