- Written by Shogo MutoDirected by Satoshi Morota
Don't worry about Sento, he's just letting off some steam.
Sento: This week, I'm doing the introduction! The self-proclaimed hottie brilliant physicist, Kiryu Sento… …What is this? Who rewrote the script? This isn't up for edits… Misora, was it you? Did you rewrite this?! Hey, wait…
Ryuuga: The self-proclaimed hottie brilliant physicist, Kiryu Sento, in order to clear Banjou Ryuuga's name and recover his own memories, he transforms into Kamen Rider Build to pursue the mysterious evil organization, Faust. Along the way, he encountered Kishida Tatsuya, who reveals Sento's true identity, but can't trigger his memory. Not only that, Tatsuya is transformed into a Smash, and after they defeat him, Ryuuga does something unexpected! What'll happen in Episode 6?!
Sento: Hey, you did it again! Even though I'm the star…
- Did Not Think This Through: The episode's first half may as well be called "Ryuuga Banjou acts first, regrets later". Let's count the ways:
- His plan to follow Press Smash/Tatsuya back to Faust's base and capture Night Rogue. All that with no concern for Tatsuya's wellbeing, no back up outside of his Dragon Bottle and the fact that Rogue is already stronger than Build, let alone him.
- His attempt to use the Build Driver during his fight with Sento ends with him passed out from the pain on the floor. This Transformation Trinket, as Kiryu puts it, is not a "one-size-fits-all".
- Tomato in the Mirror: Stalk gleefully reveals that both Sento and Ryuuga weren't failed Smash experiments - the procedures went perfectly fine. It's just that, for unknown reasons, they didn't turn into monster forms. Outside of that, both of them are bona fide Smashes. Kiryu… doesn't take this well.
- Self-Destructive Charge: After Blood Stalk poisons Banjou and reveals his true nature to him, Sento goes ballistic, wrecking the lab around them and beating the Faust operative down to the floor. Even after Stalk shrugs it off and leaves, making the lab collapse on itself, Kiryu is still furious.
- Suck Out the Poison: Ryuuga is saved this way by Claws Dragon, after he got poisoned by Blood Stalk.
- What the Hell, Hero?: Sento lays this hard on Ryuuga after he reverted Tatsuya back into a Smash in the previous episode, which soon blows up into a Full Bottle-powered brawl between the two.
- Later the roles are reversed, when Ryuuga asks if his "saving people as Build is more important than his memories" spiel was a lie after he rampages through Faust's lab without caring about the people trapped inside. This gets our hero back on track.
- You Called Me "X"; It Must Be Serious: Ryuuga calls Sento by his first name when it seems he died when Faust's base collapsed.
