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in:
Kamen Rider Build, Kamen Riders, Heisei Era Riders, and 9 more
Sento Kiryu
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This article is about a/an rider in Kamen Rider Build.
Sento Kiryu

Normal "Evolto" 

Normal
Kamen Rider Build
Kamen Rider Evol
Gender:
Male
Series:
Kamen Rider Build
Motif:
Organic objects, Inorganic objects, Science, Chemistry, Industrial manufacturing
Rider Type:
Protagonist
Hero
Anti-Hero (as Takumi Katsuragi)
Villain (possessed by Evolto)
Affiliation:
Nascita
Touto Institute of Advanced Matter Physics
Faust (unknowingly)
Homeworld:
Earth (World of Build)
First Appearance:
That One with the Best Match
Last Appearance:
TBA
Number of Episode Appearances:
49 (Build)
TBA (Zi-O)
TBA (Movies)
TBA (Specials)
Full list of appearances
Actor:
Atsuhiro Inukai
Kamen Rider Build
Kamen Rider Evol

Build Driver Evol-Driver 

Build Driver

123456789

"Now, shall we begin the experiment?" 
?Build's catchphrase before transforming[src]

Sento Kiryu (?? ?? Kiryu Sento) is a genius theoretical physicist who experiments with Fullbottles to further enhance his abilities as Kamen Rider Build (?????—??? Kamen Raida Birudo) to fight against the evil Smash organisms. A man with no memory of his past, he was initially believed to be someone named Taro Satou (?? ?? Sato Taro), but his true identity turned out to be someone else. Since the war for the Pandora Box broke out between the three countries, Sento accepted reality for what it was in order to end the war that his previous identity had started. Since the opening of Pandora Box and the resurfacing of his memories, he banded with his former enemies and fought against a common enemy who threatened to destroy Earth.
Contents[show]
History
Early Life

Main article: Takumi Katsuragi 

Takumi Katsuragi (Build)

Takumi Katsuragi before his face was altered and memories wiped by Evolto.

Sento was originally Takumi Katsuragi, a research prodigy at the Touto Institute of Advanced Matter Physics, and nicknamed the "Devil's Scientist". One of the founders of Faust, he was responsible for the creation of Smash, the Transteam System, and the Rider System.

At some point, Katsuragi found that the former astronaut Soichi Isurugi and the ex-MMA fighter Ryuga Banjo are an evil alien entity known as Evolto and they came to destroy the Earth as they did with Mars, before they were able to do it, Katsuragi decided to hide the Evol-Driver and lure the two men into his apartment in order to kill them. Katsuragi confronted Evolto as Blood Stalk, after confronting him, he attemped to transform into Kamen Rider Build GorillaMond, however Stalk somehow knew that it was a trap and switched the Build Driver with its prototype, causing Katsuragi's Gorilla Fullbottle to revert back into an Empty Bottle, then Stalk ordered Katsuragi to tell him the location of the Evol-Driver which Katsuragi refused. As Stalk knocked out Katsuragi, a man named Taro Satou arrived at Katsuragi's home to apply for a drug-testing job, which was part of Stalk's plan, only to see Stalk and run in fear. Before Taro reached the door, Stalk killed him and switched both men's faces and their clothes. Now with Satou's appearance, Isurugi wiped Katsuragi's mind after Ryuga was arrested in Katsuragi's apartment. Taken into Faust's lair, the amnesiac Katsuragi watched in horror as he was injected with Nebula Gas with Blood Stalk and Night Rogue, a black suited person with bat features, oversaw the process.

When Katsuragi did not become a Smash after the injection, Isurugi realized that Katsuragi would be useful in gathering the rest of the Fullbottles. Isurugi smuggled Katsuragi out of Faust, making it appear that he found the amnesiac man outside of the café Nascita, Isurugi's home and front. Katsuragi was given the name Sento Kiryu and taken into Isurugi's care, hidden in the secret basement laboratory inside Nascita.
Becoming Build
Sento is given the Build Driver

Soichi gives Sento the Build Driver.
Buildfirsttransformation13

At some point after being taken in by Soichi, he was provided the Build Driver and a set of Fullbottles that Soichi "stole" from Faust. During Sento's first fight against a Smash, he fought hand-to-hand but was beaten to the point where he had no choice but to use the Driver. Upon his first transformation, Sento defeated the Smash and headed back to Nascita, where Soichi and Misora were waiting for him. From that day on, Sento would continue being Kamen Rider Build in order to one day uncover the mysteries surrounding his past.
The Rabbit Tank Meets Dragon

After about a year of fighting as Build, Sento had gained some notoriety as the Kamen Rider. However, Sento's search was left at a standstill, as the Smash had no memories of their own experiments upon returning to human form. Meanwhile, Soichi, growing impatient with Sento's freeloading, directed him to a mid-level job at Touto Institute of Advanced Matter Physics.

Sento's first lead came in the form of Ryuga Banjo, an ex-fighter and wanted fugitive. Alerted by Ryuga's Smash energy readings, Sento followed and eventually apprehended him. Much to his shock, Ryuga had just escaped from the labs where Sento had been experimented on and had all his memories intact. The two were interrupted by Strong Smash, who attempted taking Ryuga away before Sento defeated it as Build. The Touto government quickly arrived and attempted to take Ryuga back into custody. Believing Ryuga's claim that he had been framed, Build helped Ryuga escape from the government, making Build a fugitive as well. That One with the Best Match
Burn Smash Incident and Meeting Night Rogue

Sento hides Ryuga in the secret lab, with Soichi scolding Sento for committing a felony. Sento explained that Ryuga was the 'best match' to his memories as they are both experimented by the same scientist group. On top of that, with exception of the location of the underground lab, Ryuga still had his memories intact. Sento deduced that Ryuga might lead him to the bat man and starts questioning him. Ryuga began the story with his birth, but Sento cut him off, stating not that far and scolded him, infuriating Ryuga and forcing him to shake Sento by the shoulders for insinuating him as an idiot. Sento told Ryuga to just start at the point of his arrest, and Ryuga told them what happened: he showed up at Katsuragi's apartment for a job, but he found him already dead at the same time the cops arrived. Isurugi objected jesterly, finding it strange for the local authorities to arrive just as Ryuga found the body, but Ryuga claims that what happened until a silver booth went off and opened a panel, unveiling the Gorilla Fullbottle. Sento runs toward it and gazed at the bottle before he commented the booth's work, which annoyed Misora as she came out and approached Ryuga, wondering who he was. As Sento theorized that the murder and Ryuga's jailbreak must have a connection until they were approached by Sawa Takigawa, a reporter. Both Sento and Isurugi were shocked as how Sawa found out about them, she showed Sento the Nascita matches set he dropped the night he saved her from the Needle Smash, and Isurugi realized he forgot to close the door behind after Sento brought Ryuga to the lab, but all four were completely unaware that Sawa was a spy for Faust and she knew the lab's entrance, grabbing a match set from a bowl to back up her cover. She then claimed to want to do a cover story on the Kamen Rider, but Sento declined until Isurugi agreed, much to the annoyance of Sento and Misora.

The next day, Sento, as Build, responded to a Smash alert, unaware it was a trap to lure him out by Faust. At the location, Build phones Isurugi to let him know there wasn't a Smash in sight until a squad of Touto Guardians appeared and open fire at Build. Build headed down near the edge of the docks and canceled his transformation, pretending to be an average joe until the Guardians left. At the Touto Institute, Sento ran into Gentoku and a few researchers watching the news as they learned that Touto has declared the Kamen Rider as a fugitive until he received a phone call from Misora, who informed him Ryuga escaped with her phone, both unaware that Ryuga learned that his fiancé, Kasumi Ogura, has been abducted by Faust as well. As Build, Sento tracked Misora's phone to an abandoned warehouse where Ryuga is being pursued by Touto Guardians. Utilizing a Vortex Break with his Drill Crusher gun mode and the Harinezumi bottle, Build asked Ryuga why he left, to which Ryuga stated he has a girlfriend he intended to marry. After defeating the Guardians in the warehouse, Build and Ryuga ran into more Guardians that merged into their Union State and opened fire, forcing Build and Ryuga back into the warehouse. Inside, Build turns into the newly acquired Gorillamond Best Match and proceeded outside, formulating a plan to take down the Guardian Union State, which included knocking Ryuga's motorcycle inside an abandoned building, allowing the Guardian Union State to pursue. As the machine made it to the right spot as its gunfire destabilized the building, Build used the Muscle Glove to destroy the machine.

As they regrouped, Sento asked Ryuga about his fiance, who revealed she was also the one whom sent him to Katsuragi's place for the job. As Sento asked why he didn't say anything, Ryuga punched him in the gut and put him in a chokehold, rendering him unconsciousness to prevent his involvement. However, Sento came to early and managed to catch up and was too late seeing that Kasumi was already transformed into the Burn Smash. As Night Rogue appeared, Sento turned into Build HarinezumiTank Trial Form and fought Rogue to demand answers for his experimentation, but