 This article is about an ally in Kamen Rider Build.
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Akaba (赤羽), born Masaru Ooyama (大山 勝, Ōyama Masaru), is a member of Kazumi Sawatari's Hokuto Sanbagarasu who transformed into the Castle Hard Smash (キャッスルハードスマッシュ, Kyassuru Hādo Sumasshu), and later the Castle Hazard Smash (キャッスルハザードスマッシュ, Kyassuru Hāzado Sumasshu).
History[]
Background[]
Masaru Ooyama was a longtime employee on Kazumi Sawatari's farm, alongside Syuuya Aikawa and Syoukichi Mihara. After the Sky Wall Tragedy rendered Hokuto's soil infertile, Sawatari used his savings to continue providing for his workers. Eventually, Sawatari volunteered for Faust's experiments, allowing himself to become a weapon of war for the sake of his workers. Out of loyalty, Ooyama and the others volunteered as well, becoming Hard Smashes to aid Sawatari. Ooyama was given the codename "Akaba".
The Japanese Civil War[]
When Hokuto Prime Minister Yoshiko Tajimi declared war on Touto, Akaba was part of the advance guard with Aoba and Kiba. Through his power as a Smash, Akaba launched a premature strike at the city. Disregarding Kiba's warning against disobeying their boss, Kazumi Sawatari, Akaba called out to their superior who was engaged elsewhere, asking if he was finished.
Akaba and the others later tracked down Sento Kiryu and Ryuga Banjo, and transformed into their Hard Smash forms. After successfully knocking them out of their transformations, Akaba demanded that they hand over their Fullbottles, prompting Aoba and Kiba to argue with him over who should get said Fullbottles. By the time they had pulled themselves together, Sento and Ryuga escaped. When the managed to find Sento with Misora Isurugi, a motivated Sento fought continued to fight them. Although the three managed to gain the upperhand, Ryuga used the Sclash Driver to become Kamen Rider Cross-Z Charge and easily defeated them, causing them to lose some of the Hokuto Lostbottles. Kazumi arrived shortly after to challenge Sento and Ryuga.
As Akaba and the others desired to be more stronger to help their boss, they underwent a Hazard Level dose using the Hazard Trigger to evolve into Hazard Smash in exchange of the side-effects of disappearing when defeated in battle. Although they were aware of the risks, one-by-one, most of the Hokuto Sanbagarasu were killed off during the Japanese Civil War with Akaba remaining as the final surviving follower of Kazumi.
Death[]
The death of Akaba.
Kazumi left Akaba in a warehouse with the task of protecting the Pandora Box while he, Sento, and Ryuga protected the dummy locations to flush out Seito's spy. Before Kazumi left, Akaba proposed to bury Aoba and Kiba's dog tags in the Sky Road passage between Touto and Hokuto. Akaba dutifully kept his eye on the box, until Gentoku Himuro bursted through the door, shocking Akaba on how he knew the box's true location. Refusing to hand the box over to Gentoku, Akaba transformed into the Castle Hazard Smash to fight Kamen Rider Rogue. Rogue brutally beats Akaba in his Smash form and despite him being in his limits, Akaba lunged forward for a final blow, but only for Rogue to send him back flying. Kazumi arrived just in time with Sento and Ryuga as Akaba began to disintegrate. With the last of his strength, Akaba thanked him for everything as he disappeared in a red smoke, and his dog tags fell to the ground as Kazumi ran toward him, calling him by his real name.
Post-Mortem[]
Kazumi crafted a grave for the Sanbagarasu at the Sky Road. However, he held onto their dog tags as he participated in the proxy battle against Seito where, despite being outmatched by Rai Washio, he was ultimately motivated to overcome his opponent by looking back to his late comrades. Kazumi would continue to fight to ensure the well-being of the late Sanbagarasu' respective families.
New World[]
Akaba, along with his friends, were among the few people who has a counterpart on the World without Sky Wall, and was seen as one of the delivery men who frequents Nascita. On one occasion, they dragged their boss to see the cute girl from the coffee shop they frequent in, which ended up with their boss passing-out after seeing Misora.
Other Events[]
Kamen Rider Build NEW WORLD: Kamen Rider Cross-Z[]
When Killbus reactivated Pandora's Box, everyone who were directly exposed to Nebula Gas in the original World of Build regained their memories from that world, including Akaba. Although he didn't participate in the fight against Killbus, the Hokuto Sanbagarasu were mentioned by Kazumi in the meeting.
Kamen Rider Build NEW WORLD: Kamen Rider Grease[]
Akaba's appearance in NEW WORLD.
Because of their memories being restored, Misora's attitude towards Kazumi went back to the way they were in the original world, which worried Akaba and the others. After a misunderstanding between Kazumi and Misora, Akaba and the others did their best to cheer their boss, to the extent that they were willing to join him in his self-searching. This led them to an island which was formed from the point of contact between the two worlds that merged. Kiba felt something dangerous from the island at first, but calmed down after finding a hot spring. While they were bathing in it, a geyser suddenly emerged, which soaked the four even further to the water. After being soaked, the four went to a cave to try and warm themselves up, as they were feeling some strange after-effect from the water. They would later recover and find their way back to the Sawatari Farm, only to find it attacked by a foreigner, which Massugu described as a green monster. Confronting the perpetrator, they were confused on to what the attacker wanted to do, and was more confused when it suddenly flew away after it saw them transform. Kazumi then contacted Gentoku, who hinted that he was captured. After the call, they then went to Sento's place to find out more. Given the task to safeguard Misora, Akaba left with Kiba and Aoba, leaving behind Kazumi due to the trauma their boss still have. Arriving just before Down Fall took Misora, they were confronted by Kamen Rider Metal Build and were taken out all at once. Regaining consciousness just after Sento was explaining the power-up item to Kazumi, the Sanbagarasu waited for their boss to leave, before willingly agreed to help Sento. Sento then explained that he will need the three to give-up a majority portion of their Phantom Liquids, the extraction was painful, but they were able to gather enough for four and complete Grease Perfect Kingdom. After Kazumi successfully defeats Kamen Rider Phantom Build, Akaba and the others revealed to Kazumi that they had to play along Sento's plan to elevate Kazumi's Hazard Level by believing them to be dead, from which Kazumi calls Sento the Devil Scientist again.
Personality[]
Akaba is a delinquent right down to his appearance and personality. He is cruel and careless, not hesitating to attack a civilian population out of boredom. Akaba sees himself as superior to his comrades, barring his boss, who he deeply respect.
Akaba, not unlike the rest of his team, is very petty and immature, even arguing over who would take Sento and Ryuga's Fullbottles after defeating them. He and his team were called idiots by Ryuga within minutes of meeting him.
Despite his negative traits, he and his fellow teammates all wanted to protect their families back in Hokuto. He also felt frustrated since he can't help his Captain much during the war. In the end, he, along with Aoba and Kiba, took Stalk's offer to strengthen them into Hazard Smashes, knowing that it could cost him his life. Kazumi himself commented that Akaba is indeed the most stupid, but also the bravest of the trio.
Aoba's death at the hands of Build using the Hazard Trigger made Akaba, as well as Kiba, initially hostile and violent towards Sento and Ryuga. However, after Kazumi decided to become Sento's ally, so that the group could better protect both Hokuto and Touto from the forces of Seito, Akaba begrudgingly forgave them, eventually forging somewhat of a decent comradery with the Touto Riders.
Forms[]
Castle Hard Smash
- Height: 215.3 cm
- Weight: 150.8 kg
Akaba transforms into the Castle Hard Smash (キャッスルハードスマッシュ, Kyassuru Hādo Sumasshu) using the Castle Fullbottle.
Abilities
- The Castle Hard Smash possesses super strength, capable of delivering powerful punches.
- The Castle Hard Smash's Ground Rampart (グランドランパート, Gurando Ranpāto) shoulder-mounted shields are capable of great defensive utility or ramming ability.
- The Castle Hard Smash can fire a green energy beam from the Catapulta Cannon (カタプルタキャノン, Katapuruta Kyanon) on its forehead.
Castle Hazard Smash
- Height: 215.3 cm
- Weight: 150.8 kg
After being administered with the Hazard Trigger's energy, Akaba can now transform into the Castle Hazard Smash (キャッスルハザードスマッシュ, Kyassuru Hāzado Sumasshu) with the Castle Fullbottle.
Abilities
- The Castle Hazard Smash possesses super strength, capable of delivering powerful punches.
- The Castle Hazard Smash's Ground Rampart shoulder-mounted shields are capable of great defensive utility or ramming ability.
- The Castle Hazard Smash can fire a green energy beam from the Catapulta Cannon on its forehead.
- The Castle Hazard Smash can launch red energy bolts from its arms.
- Height: 215.3 cm
- Weight: 150.8 kg
The New World counterpart of Akaba transforms into the Castle Lost Smash (キャッスルロストスマッシュ, Kyassuru Rosuto Sumasshu) using the Castle Lost Fullbottle.
This form is exclusive to Build NEW WORLD: Kamen Rider GreaseEquipment[]
Devices[]
- Castle Fullbottle - Transformation trinket
Behind the Scenes[]
Portrayal[]
Akaba is portrayed by Eishin (栄信). His suit actor as the Castle Hard Smash is Yuji Nakata (中田裕士, Nakata Yuuji).
Etymology[]
Akaba's name translates to "red wings", sharing a color theme with Kiba (黄羽 lit. "yellow wings") and Aoba (青羽 lit. "blue wings").
Concept Art[]
Castle Smash was designed by Tamotsu Shinohara (篠原 保, Shinohara Tamotsu).
Notes[]
- Akaba is the only Smash of the Hokuto Sanbagarasu to have an inorganic motif.
- Same as other member of Hokuto Sanbagarasu, all three name had a color name. in Akaba's case, it's aka (赤) which means red.
Appearances[]
Kamen Rider Build
- Episode 16: The Weaponry Hero
- Episode 17: Rider Wars Start
- Episode 18: The Golden Soldier
- Kamen Rider Build: Birth! KumaTV!! VS Kamen Rider Grease! (Smash image only)
- Episode 19: The Forbidden Item
- Episode 20: The Devil's Trigger
- Episode 21: The Unstoppable Hazard
- Episode 22: Victory of Tears
- Episode 23: The Phantom of the West
- Episode 24: A Man Called Rogue
- Episode 25: The Idol Awakens (death)
- Episode 36: Evolto Hunts the Stars (flashback; archive footage only)
- Episode 40: The Final Revolution (flashback; archive footage only)
- Episode 46: An Oath to Be The One (imitation by Evolto)
- Episode 49/Final: The Tomorrow Build Will Create