“Isanami, a young priestess of Izumo, is forced to watch as a group of evil ninja burn her temple to the ground and slaughter the people within, leaving her no choice but to flee into the forest to escape the same fate. By chance, she stumbles upon Saizou Kirigakure, a masterless ninja from the Iga school. The two travel to Ueda Castle to ask Yukimura Sanada for help. Isanami's possession of a strange and devastating power is revealed, and Sanada readily agrees to help her, gathering ten brave warriors to Isanami's side. Thus begins Brave 10, a story set in the Warring States period. It follows Saizou and Isanami's journey throughout the war-laden lands in search of brave warriors to serve under Yukimura's banner, each possessing powerful skills of their own. They'll have to travel far and wide, all while trying to fend off those who would chase after the dark power that she possesses to make it their own.”

- https://myanimelist.net/anime/11241/Brave_10

Episode 25 : Zero

“Lelouch uses Geass on Cornelia and discovers she does not know who killed his mother. C.C. senses that Nunnally has been taken to Kamine Island and Lelouch abandons the Black Knights to rescue her. There, C.C. stays behind to stall Jeremiah while Lelouch is confronted by Suzaku. While Kallen watches on, Suzaku shoots Lelouch's mask revealing his identity to the two of them. Lelouch pleads with Suzaku to help him save Nunnally but is rebuffed; off-screen, the two fire their guns at each other.”

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/25

Episode 24 : The Collapsing Stage

“The Black Knights are able to push the Britannian Army back and use Ashford Academy as their headquarters. Lelouch and C.C. battle against Suzaku and are able to lure him into a trap which drains his Lancelot's power. Villeta regains her memories and shoots Ohgi. Lelouch confronts Cornelia and has the Geass influenced Andreas Darlton incapacitate Cornelia's Knightmare. Meanwhile, Nunnally is visited by V.V. who intends to take her away.”

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/24

Episode 23 : At Least With Sorrow

“After locating Euphemia, Lelouch shoots and mortally wounds her. Suzaku witnesses the shooting and brings Euphemia to the Avalon for emergency treatment. Euphemia fights off the Geass and has a last talk with Suzaku before dying; while Suzaku mourns over her death, V.V. introduces himself and explains why Euphemia caused the massacre. Meanwhile, Zero announces his plan to overthrow Brittania and to create a new country called the United States of Japan. Soon, the entirety of Area 11 revolts against the Britannian Empire and the Black Knights advance toward the Tokyo Settlement.”

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/23

Episode 22 : Bloodstained Euphy

“During the commemoration ceremony for the SAZOJ, Lelouch and Euphemia privately discuss Japan's future. She convinces him and Lelouch summarily halts his rebellion until he suddenly loses control of his Geass while jokingly telling her to kill all the Japanese. The Geass-influenced Euphemia orders a massacre of the people attending the ceremony. Blaming himself, a resolute Lelouch decides to salvage the situation by declaring Euphemia's SAZOJ a trap to lure out the Black Knights and commands his troops to defeat the Britannian forces, protect the Japanese, and to kill Euphemia.”

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/22

Episode 21 : The School Festival Declaration

“The Ashford Academy holds their annual school festival. Ohgi, Villeta, Euphemia, and Kallen all make their separate ways to the event and a series of close encounters risks the revealing of their hidden identities. When Euphemia's presence is revealed, mass panic ensues. On live television, she announces her plan to turn the area around Mount Fuji to become a Specially Administrated Zone of Japan (SAZOJ), where Elevens can be referred to as Japanese again. She believes this will bring back the happy days with Lelouch and Nunnally, but Lelouch thinks otherwise, knowing she is being naive.”

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/21

Episode 20 : Battle At Kyushu

“The Britannian Army fights back against the Kyuushuu invaders with the Lancelot. Meanwhile, Nina meets Princess Euphemia and inadvertently gives Euphemia peace of mind about her feelings for Suzaku. As Suzaku becomes cornered when his Lancelot's power runs out, Zero and C.C. fly into the battlefield in the Gawain to recharge the Lancelot; the two Knightmares end the Kyuushuu campaign together.” 

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/20

Episode 19 : Island Of The Gods

“The aftermath of the Avalon's arrival inexplicably leaves Lelouch, Euphemia, Kallen, and Suzaku on the mysterious Kamine Island. Suzaku encounters Kallen, and learns she is a Black Knight and the pilot of the Guren, while Euphemia is found by Zero, confirming her suspicions that he is Lelouch. Meanwhile, Schneizel, Lloyd, and Cécile Croomy survey the island's ancient ruins. When Lelouch, Kallen, Suzaku, and Euphemia suddenly fall into the ruins, Lelouch and Kallen steals the Knightmare Frame Gawain to escape. As Suzaku is detained for insubordination, it is revealed that Lelouch used Geass on Suzaku, giving him the command to live, through which he prioritized his own survival over Zero's capture. Elsewhere, the exiled Japanese government from seven years ago launches a full-scale assault on Kyuushuu with the help of the Chinese Federation.” 

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/19

Episode 18 : I Order You, Suzaku Kururugi

“As Euphemia knights Suzaku, Lelouch establishes the hierarchy of the Black Knights. Diethard Reid suggests assassinating Suzaku, but Lelouch has other plans for him. He launches an operation to capture Suzaku and the Lancelot at a Britannia military base on Shikinejima. It almost succeeds, but Schneizel el Britannia appears and orders his floating battleship, the Avalon, to bombard the island, intending to sacrifice Suzaku in order to kill Zero.”

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/18

Episode 17 : Knight

“An inauguration ceremony of Clovis' memorial art museum is held, with Euphemia judging the art works. Lelouch agrees to help Kyoshiro Tohdoh's comrades rescue their leader. During the rescue mission, Lelouch convinces Tohdoh to join the Black Knights. The Lancelot appears and attempts to stop them, but Lelouch is able to predict its movements and plan a counterattack. Lancelot's cockpit is damaged revealing Suzaku within. Lelouch is shocked and orders an immediate retreat as reinforcements arrive. At the museum, Suzaku is scorned by the Britanians due to his nationality; in return, Euphemia announces to have Suzaku instated as her knight.” 

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/17

Episode 16 : Nunnally Held Hostage

“C.C. departs as a messenger to the Chinese Federation and Milly has a marriage interview with Lloyd Asplund, creator of the Lancelot. Mao returns to kidnap Nunnally and holds her hostage in the Ashford Academy sewers. Lelouch and Suzaku work together to rescue her, with Suzaku's physical adeptness and the clever use of Lelouch's Geass proving to be beyond Mao's planning. Before he can be arrested, Mao reveals that Suzaku killed his own father; in return, Lelouch silences Mao with his Geass and C.C. returns and kills Mao.” 

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/16

Episode 15 : Cheering Mao

“C.C. explains her history with Mao and how his inability to turn his Geass off drove him insane. An injured Villetta wakes up in Ohgi's apartment and he discovers she has selective amnesia. C.C. leaves Lelouch to take care of Mao herself, but Mao gains the upper hand when he incapacitates her. Lelouch utilizes his intellect to fool Mao and rescue C.C. using the Britannian Police to surround and shoot Mao. Safe on a rooftop away from the scene, Lelouch reaffirms his contract with her, promising not to fall victim to his power as Mao did.” 

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/15

Episode 14 : Geass Vs. Geass

“Lelouch believes Shirley may have discovered his identity as Zero, so he and C.C. pursue her to Narita. Ohgi explores the battlefield of the previous night, discovering a wounded Villetta left for dead out of sight. Lelouch encounters Mao, a young man who uses his Geass mind-reading abilities to play on Shirley's insecurities, manipulating her into shooting Lelouch. Shirly falters at the last moment and C.C. sends Mao away temporarily. With Shirley torn apart by grief and guilt, Lelouch uses his Geass to erase her memories of him.”

 - https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/14

Episode 13 : Shirley At Gunpoint

“Kallen and Lelouch separately reflect upon the deaths of innocents in the Narita campaign, with both vowing to press on. Villetta questions Shirley on Lelouch's involvement with the Black Knights coaxing her to secretly follow Lelouch. There, she witnesses the battle between the Japan Liberation Front and the Britannian Army. Lelouch detonates the Japan Liberation Front freighter as the Britannian Knightmares begin to board it, killing all personnel on board and giving the Black Knights the element of surprise. Suzaku attacks Lelouch forcing him to eject and crash-lands near Shirley. She prepares to kill him to avenge her father, but hesitates when his mask falls off, revealing his identity to her.” 

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/13

Episode 12 : The Messenger From Kyoto

“Zero and core members of the Black Knights meet with Taizou Kirihara, one of the most powerful people in the Japanese underground and an acquaintance of Lelouch from his younger days at the Kururugi Shrine. Lelouch deftly displays his tactical prowess and wit before Taizou, revealing his true identity to the man to gain his trust and support. When Lelouch returns to Tokyo, Shirley Fenette informs him of her father's death, indirectly caused by Zero during the Battle of Narita.” 

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/12

Episode 11 : Battle For Narita

“The Black Knights' assault on the Britannian Army in Narita proves successful and Cornelia is cornered by Kallen and Lelouch. At Euphemia's request, Suzaku rushes onto the battlefield in the Lancelot to rescue Cornelia. He saves her and manages to corner Lelouch. C.C. comes to his rescue by using her powers to mentally traumatize Suzaku. The Black Knights retreat from the conflict, leaving the Japan Liberation Front and the Britannian Army to fight among themselves.”

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/11

Episode 10 : Guren Dances

“Cornelia and the Britannian Army heads to Narita, hoping to destroy the remnants of the Japan Liberation Front. Lelouch has his Knights follow her in the hope of capturing her alive so he can question her about his mother's death. As the Britannian forces close in on the Front's headquarters, Kallen utilizes her new Knightmare Frame, the Guren Mk-II, to cause a massive landslide that takes out much of the Britannian forces.”

- https://myanimelist.net/anime/1575/Code_Geass__Hangyaku_no_Lelouch/episode/10