And Then There Were No Riders

is the thirty-ninth episode of Kamen Rider Den-O.
==Synopsis==
While Ryotaro tries to figure out the true purpose of Yuto's interactions with both present and past actions, Kai decides to experiment in eliminating Zeronos in the past.
==Plot==
After Den-O Sword Form destroy the Pandarabbit Imagin as he just completed the contract, Ryotaro uses the card from the contact holder to go the time the Imagin was to terrorize. Once at September 13, 2006, Ryotaro and Kohana find Sakurai wandering there, adding to the mystery behind Kai. Meanwhile, Kai decides to express his anger towards Ryotaro with the female Snail Imagin aiding him. The next day, Ryotaro crashes into Yuto after he and Deneb went grocery shopping. After Yuto leaves him while they were discussing Airi's memory, Kai appears and engages Ryotaro in a talk about the morals of time alterations before Momotaros takes over and the Tarōs state their disgust for Kai. Annoyed with the "traitors", Kai sends the female Snail Imagin back in time to March 27, 1993, before Yuto acquired the Zeronos arsenal. Ryotaro and Yuto arrive only to see the Imagin kill the younger Yuto by destroying the field trip van. As a result, Yuto fades away before Ryotaro's eyes. Though she gloats, Ryotaro transforms to Liner Form and destroys the female Snail Imagin. Though Ryotaro expected Yuto to reappear as everything she obliterated was restored, only to realize he has no memory of Yuto at that time and the Zeronos Cards ensure no one at that time remembers Yuto, either. When Ryotaro returns to the present, he finds the Milk Dipper completely changed as in this timeline, Airi and Sakurai had never met.
==Cast==
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===Guest Cast===
*Contract holder: 
*Teacher: 
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===Suit actors===
*Kamen Rider Den-O/Momotaros: 
*Urataros: 
*Kintaros: 
*Ryutaros: 
*Kamen Rider Zeronos: 
*Deneb: 
*Pandarabbit Imagin, Snail Imagin: 
==Forms==
*Den-O: Sword Form, Liner Form
==Notes==
*As part of Super Hero Time, this episode aired alongside episode 35, .
*Viewership: 5.9%
*The younger version of Yuto, although still portrayed by Nakamura, has completely different hair from his future self, including a lighter color.
*This episode's title is a pun on the famous novel by Agatha Christie, , and the movie of the same name.
==DVD releases==
Kamen Rider Den-O Volume 10 features episodes 37-40: I Have The Face For It, Don't I?, The King Train Within the Train Terminal, The Rider Disappears As Well and Change Imagin World.
Blu-ray Box 3 comes with 13 episodes.
Category:Kamen Rider Den-O
Category:Episodes