- Written by: Nobuhiro MouriDirected By: Takayuki Shibasaki
After obtaining the Grand Zi-O Ridewatch, Sougo prepares to activate it but the defeated Yuto Sakurai and Deneb intercept him. Yuuto said that Sougo cannot be allowed to use the new Ridewatch, as he will surely become demon king. Hearing that, Momotaros takes back his Den-O Ridewatch, thus cancelling the union of 19 Heisei Ridewatches.
However, this was merely a trial leading to Sougo Tokiwa's obtainment of ultimate power.
There is also the question of Another Den-O — who has hijacked the Train of Time, DenLiner — and the Imagin that has followed him.
Have they traveled to the past, or the future…?
After that, Sougo and co return to 95 DO to discuss their next plan, bringing Yukihiro, the host of Mole Imagin with them. Woz procures the victim’s Rider Ticket, and seeing the year 2017 written in it, he thinks that the Imagin and Another Den-O’s designation is 2017. Momotaros, who wants to retake the DenLiner, proposes to go to 2017, but without the DenLiner they cannot make a time trip… until Geiz mentions that they have Time Mazines for that purpose.
Sougo and Tsukuyomi stay for awhile in 2019 to ask Yukihiro about Another Den-O. Yukihiro says that Takuya, the host, is his girlfriend’s brother. His girlfriend is always sick, but Yukihiro took her out from hospital before she passed away. Thus, Takuya blames him for killing his sister. After knowing this, Sougo prepares to go to 2017.
In 2017, Another Den-O went to his sister’s hospital and began to terrorize the patients. His aim is to attack Yukihiro before he took his sister away. Geiz, Woz, and Momotaros arrived afterward. The Imagin wanted to defeat Another Den-O himself, so he tries to possess Geiz again. But, Geiz used Woz as a shield, thus Momotaros possessed Woz instead. Momotaros transformed into WozGingaFinaly, and successfully repelling Another Den-O, which at this point distracted at seeing his sister taken away by Yukihiro. Woz then kicks Momotaros out from his body.
Sougo arrived in 2017 to visit the past Takuya and brings him a message from his sister (as he heard from Yukihiro from the future). It turns out, she asked Yukihiro to take her away from hospital, as she doesn't have long and she wished to spent her remaining days with her boyfriend. Hearing this, the past Takuya can only apologize to Yukihiro as he was antagonizing him. After observing Sougo resolve this conflict, Momotaros declares Sougo as a cool guy, and finally gives him the Den-O Ridewatch. Unbeknownst to them, Deneb in a disguise watches them from afar…
As Another Den-O strikes again, Sougo and Momotaros are preparing to fight. But now he got an army of Mole Imagins from many timelines behind, overwhelming them. Sougo tries to transform into Grand Zi-O, until Yuuto reappears to stop him. But, Yuuto's resolve is wavering because Deneb told him about Sougo's action to resolve Takuya's conflict beforehand, thus finally letting him use the Grand Zi-O Ridewatch.
Sougo then transforms as Grand Zi-O, this moment renders even Woz speechless. Grand Zi-O summons Build, Kuuga, and OOO to assault the Another Rider, then he pauses during OOO's Tatoba Kick to summon Kuuga's Titan Sword and slices him. After the Another Rider is blown away, Grand Zi-O continues OOO's Tatoba Kick and also summons Gaim for good measure.
Momotaros want to join the fray too, but he cannot transform into Den-O as he gave his power to Sougo. He rants angrily, but Sougo summons Den-O from 2008, and Momotaros went on to possess him. He accessed Climax form to fight the Mole Imagins and alongside Zeronos Vega Form, quickly disposed of them.
Continuing the fight, Grand Zi-O summons Build Genius form, Gaim Suika Arms, OOO Gatakiriba Combo, and Kuuga Pegasus form. He pauses them again and now uses Build's Fullbottle Buster and his own Saikyo Zikan Girade to attack Another Den-O. As the Another Rider is stunned, the summoned Riders finished him, finally destroying Den-O Anotherwatch.
After the battle, future Takuya visits Yukihiro and his sister on a bridge. His sister asks him not to antagonize Yukihiro, as her release from the hospital is her final request. Takuya falls in tears and the conflict is resolved. Momotaros, observing the resolution from afar, confessed that he took a liking to Sougo… but the junior rider disappeared.
A confused Sougo arrived in a barren field, only to realize that Oma Zi-O himself is standing before him. The future Demon King said that Sougo finally collects all Heisei Riders’ powers and challenges him to a battle. And thus, they clash…
Episode Tropes
- Bittersweet Ending: Takuya is now aware that his sister’s disease is terminal and that she is going to die soon, but has come to terms with the fact that Sayuri is trying to die on her own terms by spending one last moment with her boyfriend Yukihiro at one of their cherished date spots before her death, wishing them happiness.
- Curb-Stomp Battle: From start to finish, GrandZi-O easily demonstrates in his fight with Another Den-O II that the Another Rider never stood a chance.
- Help Yourself in the Future: The Mole Imagin used the Den-Liner to bring some versions of himself across the timeline as extra muscle.
- Heroic Willpower: Although this act lets the Mole Imagin escape, Woz was able to force Momotaros out of his body without any outside help.
- Loophole Abuse: Since the Den-O Ridewatch was made with the powers of Den-O (and said Ridewatch was used with the other ones to make the GrandZi-O Ridewatch). Momotaros can't transform into Den-O. Sougo gets around this by using GrandZi-O's powers to summon a past copy of Den-O for Momotaros to possess.
- Mythology Gag: In his intro, Woz quotes the opening narration for Kamen Rider Den-O.
- The Power of Hate: Yukihiro never told Takuya that Sayuri’s disease was incurable because Sayuri knew Takuya was suffering enough as it was, and might have shut down following her death, so Yukihiro let Takuya hate him for Sayuri’s death as a means of being able to continue on.
- Power Up Let Down: Two examples:
- Momotaros takes back the Den-O Ridewatch after Yuto calls Sougo the Overlord, which also removes the GrandZi-O Ridewatch from existence since Sougo doesn’t have the powers of all 19note of his predecessors at his disposal.
- Momotaros gets motivated to join the fray after seeing GrandZi-O in action, only to be informed by Woz that giving Sougo the Den-O Ridewatch meant Momotaros could no longer transform into Den-O. Sougo deals with this by summoning a copy of Den-O from 2007 so that Momotaros could enter the fray.
- Stealth Hi/Bye: At the end of the episode, Sougo disappears right as Momotaros was praising Sougo, but only because Oma Zi-O called Sougo into 2068 as GrandZi-O.
