Rider Time Zi-O vs Decade Final Chapter

Back at school. Swartz is ecstatic at the sight of two more Sougo, and he names them Sougo E and F, respectively, but Misa Kudo corrects him, saying they are Sougo D and E instead. Swartz agrees, and calls the one with the baseball bat Sougo D and the teddy bear one Sougo E, as he invites them to participate in the student president race.

On the roof, Woz says to himself that among the four Sougo, the best one will be the key to save the world, and the election may help determinate that. Somewhere else, Tsukuyomi is seen carrying the mysterious boy on her back, but they are surrounded by Inves. She proceeds to transform and defeat them, but gets her leg wounded in the process, which worries the boy.

Sougo D bullies other students into voting for him, while Sougo E manages to win the affection of the other teddy bear lovers.

Sougo C is called outside for a private talk with Misa, who attempts to give him a "reward" for having killed Sougo A. However, it is revealed that Sougo C is actually Sougo A in disguise, and the one who has perished in the previous battle is, in reality, the real Sougo C, the two having switched costumes beforehand. Sougo A, through this, finds out that Misa is the one Sougo C has talked to on the stairway, as she wants him to get rid of Sougo A so that there would be less competition for Sougo B. Just then, Sougo A notes that he is actually not the killer of Sougo C, but rather someone else, who has jumped in as their final attacks collide, and he wants to know who it is. Tsukasa, revealing himself as the one Sougo A is looking for, makes his presence known, and declares war on all of them, so that he can defeat the "true Sougo", whom he says would become Ohma Zi-O. Sougo D goes to pick a fight with Tsukasa. Sougo A attempts to help, but is stopped by Heure. Sougo D is soundly defeated by Decade and perishes.

Sougo A watches the fight in distress and thinks that the Sougo who disappeared must have felt very painful.

The following day, Tsukasa breaks the school doors open for the Inves outside to invade, much to the ire of Sougo B. He and Sougo E find Tsukasa later for a battle, but is interrupted by Sougo A, who demands to know the purpose of all the fighting, to which Tsukasa replies that Ohma Zi-O has to be stopped. Sougo A and Tsukasa transform and fight, as the two other Sougo stand by and watch. As Zi-O and Decade drag their fight to a wasteland, Tsukuyomi appears before them, accompanying another child, much to the surprise of Sougo.

In an unexpected turn of events, the child turns out to be the "true Sougo", who has apparently become weakened because of having created and destroyed too many worlds. In an attempt to find a host body, he has gathered many Sougos from different dimensions. With Sougo E having been killed by him, he orders Sougo A and B to fight to find the winner. As the two are about to transform, Swartz suddenly arrives and announces that Sougo A is the winner in the school student president election. Seeing that he has lost, Sougo B admits defeat and leaves, telling Sougo A to take care of things. Since Sougo A is the only Sougo left, the child transforms into Ohma Zi-O, commands him to lend over his life and fires a blast at him. However, Heure jumps in front of Sougo and takes the blast, dying as a result. Grief-stricken by his death, Sougo transforms into Zi-O for a showdown, with the support of Decade and Another Decade.

Tsukasa attempts to intervene by equipping the K-Touch 21 and transforming into Decade Complete 21, but his weakened condition proves fatal, with Ohma Zi-O easily defeating Tsukasa once more. Once Sougo A manages to remanifest, he finds Tsukasa near the pond where Ohma Zi-O has defeated him earlier, and is given the Saber Ridewatch. Zi-O uses the Ridewatch to transform into DecadeArmor Saber form, and manages to defeat Ohma Zi-O, after the tyrant showed a brief moment of weakness and hesitation when reminiscing his time spent with Tsukuyomi.

He congratulates Sougo and declares that he is now Ohma Zi-O from this point onwards, laughing triumphantly before exploding. Tsukasa begins to disintegrate, relieved that his journey will finally be over before quietly passing away and restoring all seven timelines to their original state. In the restored world, Sougo parts ways with Sougo B, who expresses his consent of having met his original counterpart.

Sougo asked him where he’ll go, and he said wherever, as long as Misa was with him. He and Misa then got on the bike and drove off, returning both of them into their home world. Geiz said that two Sougos shouldn’t be allowed to live in a single, original world. Sougo returns to his life with Tsukuyomi and Geiz.

Although Tsukasa is seemingly dead, Black Woz does believe Tsukasa and Ohma Zi-O may return in the near future.