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Mamiya is the inheritor of the Mumeiken Kyomu and the main antagonist of Kamen Rider Saber: Trio of Deep Sin. He is the one who gave copies of the Amazing Siren Wonder Ride Book to Shinjiro Shinozaki and Yuina Tachibana, granting them all the power to transform into Kamen Rider Falchion with the goal of erasing the Sword of Logos swordsmen from existence.
He is portrayed by Ryo Kimura, who previously played Argos in Kamen Rider Ghost. As a child he is played by Touma Matsuhara.
Biography[]
Past[]
When he was three years old, Riku Mamiya lost his parents to a battle between the Sword of Logos and the Megid. He was placed in an orphanage, but ran away and was found by the Mumeiken Kyomu. Touching it caused part of himself to split off into an adult form as "Mamiya", while his younger child self "Riku" was found by Touma and adopted.
Possessing no memories of himself beyond the fact that his father had died because of a battle the Swords of Logos was involved in, Mamiya vowed revenge against the swordsmen and sought to use the Mumeiken Kyomu's power to erase them from existence.
Plot to Erase the Swordsmen[]
Mamiya found two others who had also lost loved ones to the Sword of Logos's battles, Shinjiro Shinozaki and Yuina Tachibana, and gave them copies of the Amazing Siren Wonder Ride Book that allowed them all to transform into Kamen Rider Falchion. The three then set about erasing the swordsmen from the memories of all their peers in order to slowly eliminate them. Mamiya would insert himself into Touma's life by altering his memory to make him believe he was his third childhood friend, all while befriending the other swordsmen while erasing the memories they had of Touma.
After erasing Mei's memories of Touma, the only people left who had memories of him were Riku, Touma's pet dog Lucky and himself. Mamiya would attempt to make Touma feel what he felt from losing his father by killing Riku and Lucky, but Touma became Kamen Rider Saber to defend them. After fighting Falchion off, Touma discovered that his true identity was Mamiya, prompting Mamiya to reveal the truth about his scheme to get revenge on the Sword of Logos. Despite this, Touma still acknowledged Mamiya as a friend, but this only angered Mamiya and led him to transform into Falchion to attack Touma again. Touma was able to blast Mamiya away, but in doing so reverted his own transformation. As Falchion attempted to make another strike on Touma, Riku picked up the Kaenken Rekka and used it to block Falchion's blade. The clash of blades caused Mamiya to remember that he was one half of Riku and realize how much Touma had cared for him. Acknowledging Touma as his father, Mamiya used Amazing Siren's power to stop his past self from touching the Mumeiken Kyomu, resulting in it disappearing, and undoing his entire scheme.
Forms[]
