This article is about a/an episode in Kamen Rider Build.
Red alert WARNING: This episode contains scenes of murder. Viewer discretion is advised!

The Truth of the Best Match (ベストマッチの真実 Besuto Matchi no Shinjitsu) is the forty-first episode of Kamen Rider Build. It features the debut of the Fukurou and Kuwagata Lost Fullbottles and marks the return and death of Kyoichi Shimizu since his last appearance in Episode 1.


Shinobu Katsuragi, Sento’s father and the lead researcher behind the Pandora Box and Ryuga Banjo… is alive?! In order to confirm if this was true, Ryuga was given an important piece of data. The data contains a recording made by Shinobu himself relaying information on the designs of the Build System. Furthermore, there is information within that contains the truth behind all the Best Matches! “Rabbit” and “Tank”… just why are they considered to be “Best Matches”? When Sento starts to uncover the truth behind them, Misora’s expression suddenly starts to change…


to be added


Guest Casts

Suit Actors

Forms and Collectibles Used


  • Bottle used:
    • Build
      • Biotic: N/A 
      • Abiotic: N/A 
      • Other: Genius
    • Stag Lost Smash
      • Kuwagata
  • Form used:
    • Build
      • Genius Form


  • Bottle used:
  • Form used:
    • Evol
      • Cobra Form (Phase 1), Black Hole Form (Phase 4: Perfection)


  • Sento claims that Shimizu was the first man to ever be turned into a Smash. However, Sento fought the Fang Smash during his first stint as Build an entire year before the series had started. Also chronologically, Build saved Sawa Takigawa from the Needle Smash the night before Build even fought Shimizu.
    • This claim is most likely a callback to a Rider's "debut" fight, as Shimizu was the first antagonist to fight Sento after viewers were shown Build's first on-screen transformation.


Kuwagata Lost CS
  • Closing Screen Lost Fullbottles:
    • Lost Fullbottles:
      • Biotic: Kuwagata
      • Abiotic: N/A
  • Count at episode end
    • Bottles in Build's possession: RabbitTank Sparkling, FullFull RabbitTank, Genius
    • Bottles in Cross-Z's possession:
    • Bottles in Rogue's possession: Crocodile Crack
    • Bottles in Evol's possession:
      • Biotic: Rabbit, Gorilla, Taka, Ninjya, Panda, Harinezumi, Lion, Dragon, Kaizoku, Octopus, Phoenix, Wolf, Unicorn, Rose, Turtle, Kabutomushi, Kuma, Dog, Santa Claus, Spider, Tora, Kujira, Shika, Kirin, Penguin, Obake, Same, Hachi, Sai
      • Abiotic: Tank, Diamond, Gatling, Comic, Rocket, Syoubousya, Soujiki, Lock, Densya, Light, Robot, Smapho, Keshigomu, Helicopter, Watch, Camera, Televi, Mic, Cake, Reizoko, UFO, Jet, Pyramid, Senpuki, Sukebo, Magnet, Bike, Sensuikan, Dryer, Castle
    • Bottles in MadRogue's possession:
      • Biotic: Bat
      • Abiotic: Engine
    • Jellies in Grease's possession: Robot, Dragon
    • Evolbottles in Evol's possession:
      • Biotic: Cobra, Rabbit
      • Abiotic: Rider
    • Evolbottles in Cross-Z's possession:
    • Lost Bottles in Evol's possession:
      • Biotic: Bat, Cobra, Shimauma, Fukurou, Kuwagata
      • Abiotic: Hasami
  • Sento Kiryu is the only one in Team Build to be henshin.

External links


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