"Kudo! Fight like you are!" With the advice of Minato, Houtaro and Rinne manage to escape their predicament, but Rinne's feelings and the future of the "Romeo and Juliet" production become uncertain. Furthermore, Atropos appears with a new Malgam. Houtaro and Rinne transform into Riders, but Majade strikes them with a powerful blow...!
Renge, who was visiting her grandmother's village, informs Houtaro and the others that a yokai has appeared and she wants them to come immediately. In that village, a man named Starshine Hoshino, who calls himself a specialist in exterminating yokai, appears, and his apprentice is Kajiki!? Houtaro and Rinne arrive in the village and immediately discover the yokai! Houtaro transforms into Gotchard...!
Geryon has unleashed the deadliest Malgam to open the door to darkness. Rinne and Supana transform into Riders to face him, but they are cornered by his powerful force. Houtaro transforms into Iron Gotchard to save them. They go head-to-head, but gradually his strength is depleted and he is unable to transform. Just when all seemed to be lost, Fuga appears. "I will light the way for these youth." And then Fuga...!
Houtaro and the others are overjoyed to receive a letter from Minato saying that he will take down Geryon. They immediately rush to the location Minato has designated, but suddenly a new Malgam appears. Houtaro is deprived of all his cards except for Steamliner. He is unable to transform into Gotchard. Houtaro still wants his cards back, so he consults with Kyoka and learns that there is only one way to transform, though it is a forbidden technique...
Renge has fallen under the spell of Zukyumpire. Zukyumpire attracts many men and women, but when Houtaro and his friends investigate, they discover that Renge and the others are in danger...!? Meanwhile, Geryon, who has failed to dye Supana with malice, begins a new course of action using Clotho!
Houtaro drives the runaway Wheel Malgam into de-transformation with the power of Fire Gotchard. However, Supana stubbornly shuts his mind, saying to Houtaro and the others, "This is my battle," and remains engulfed in black flames. Houtaro and the others support Kyoka in making a new driver for Supana. They continue working on it through the night, but now Geryon's evil hand is closing in on Kyoka..!
Kyoka arrives to see Houtaro and the others. Kyoka, who claims to be Supana's teacher, begins to talk about Supana's past, which even Houtarou and the others did not know. "It all started 10 years ago..." At that time, Supana's parents appear before him, worried that he will never be as strong as Houtaro and Rinne. Supana is happy to see his parents again after a long time, but...!?
Houtaro and Rinne are disappointed in a world where not only the Alchemy Academy, but also their teacher Minato does not exist. The Moon Malgam then appears in front of the two and mocks Rinne where it takes her into the shadows. "What should I do to become stronger and defeat the Moon Malgam?", asks a worried Houtaro. Gotchard Daybreak then replies. "I will transport you to the past." Just what is in Houtaro's past? What should he do there?
The raw power of Super Gotchard overwhelms Dread and gains an upper-hand, but Dread is capable of executing counterattacks, resulting in a back-and-forth battle. Meanwhile, Lachesis approaches the daughter-father duo Sawa and Manabe. Rinne attempts to protect them but Atropos intervenes with her magical abilities. "So you are powerless after all." Rinne is robbed of her bodily freedom by the triumphant Atropos...?!
"There's something I'd like to ask of you, Ichinose." Houtaro is asked by Rinne, who has a thoughtful look on her face, to confide in him about a certain problem of hers. Just what exactly is on her mind? Then the two are dispatched to the appearance of a new Level 10, X-Rex. Houtaro and Rinne attempt to tame it but encounter a little girl instead...
Clotho captures a Level 10 Chemy for the Three Dark Sisters and subjects it to their creepy experiments, bringing them closer to completion of "something". Meanwhile, Kugimiya and Harima from the Alchemys Union arrive at the academy and warn the students that there may be a mole within their ranks. However before he begins investigating on who the possible mole is, he heavily criticizes Houtarou's fighting style as a Kamen Rider.
Hijiri, whom Kajiki is in love with, has a boyfriend! Although Kajiki is depressed, he learnt that Hijiri boyfriend is most likely the remaining suspect who made his escape after Clotho attacked the police van! If that's the case, then there's a possibility that the suspect has already became a Malgam. Hijiri who is with Kajiki is in danger! Houtarou and Minato start searching for the suspect together, but...!
Saboneedle flew out of the driver during the battle with Dragonfly Malgam. Houtarou senses something as Riku becomes more distraught than ever, asking, "Where has Sabosuke gone?" Meanwhile, Atropos suddenly appears in front of Rinne...!
After transforming into Kamen Rider Gotchard, Houtarou wants to learn more about the Chemmies and is advised by his teacher Minato to take the entrance exam for the secret Alchemy Academy. However, Houtarou runs into a problem. Meanwhile, Ryo Kajiki meets a talking skateboard who loves to play with children, but...
Takeshi Hongo is a promising young man with a passion for motorcycle racing. However, his dreams are suddenly ruined when he gets kidnapped by Shocker, the evil secret organization planning to dominate the world. After being remodeled into a cyborg, Takeshi escapes and swears to protect the world from the inhuman monsters.