There are no continues for those who die frozen in time. He is trapped in the moment of death... permanently.
~ Masamune after killing Lovrica Bugster.
The human known as Masamune Dan has ceased to exist. I am an existence with the powers of both Cronus and Gamedeus. The overseer of Kamen Rider Chronicle... and the True Final Boss.
~ Masamune after absorbing the data of Gamedeus.

Masamune Dan is the founder of Genm Corp and primary antagonist of Kamen Rider Ex-Aid, having manipulated the events of the series to further his own goals. His ultimate objective is to become the controller of everybody's lives by trapping everyone within Kamen Rider Chronicle.

He was portrayed by Hiroyuki Takami.


Though he keeps up the guise of a friendly and benevolent businessman, Masamune's true personality underneath is that of a self-centered and manipulative sociopath who cares for nothing but his own goals, being willing to kill thousands of people in order to achieve them. He addresses each of the Kamen Riders and Bugsters by the Rider Gashats they use or in the game they originated from, viewing them not as living beings but as products of the Genm Corp and even refers to killing them off as "discontinuing a product".

For the first half of the series, Masamune keeps up the facade of a well-meaning CEO and father while he is behind bars and Kamen Rider Chronicle is in development. However, after he is released from jail and his plans start to come to fruition, Masamune reveals himself to be a tyrannical control freak who believes he has the right to control everyone's fates and is willing to do whatever it takes to see the end result of his goals, including resorting to underhanded and deceitful tactics.

Even after he has been defeated, Masamune clings to his belief that he is the controller of everyone's lives, and kills himself purely out of spite to preventing the victims of Kamen Rider Chronicle from being saved.

A more humane side of Masamune was explored in Another Ending trilogy, where it is revealed that Masamune was once a loving man who genuinely cared about his wife, before he eventually turned insane because of her infection of Bugster virus. He was also horrified by Kuroto's plan and insanity, and he would stop him no matter what the cost. However, Masamune still refuses to show remorse over his manipulation over Kuroto. Instead, he only curses his son, wishing the latter was never born.


Discovering the Bugster Virus

16 years ago, Masamune Dan learned of the existence of the Bugster Virus from his son, Kuroto Dan, who discovered it after it emerged from the Y2K crisis. Unbeknownst to everyone but himself, Masamune infected himself with the virus to develop an antibody for it within him.

After his son caused Zero Day and pinned the blame on him, Masamune willing took responsibility and allowed himself to be incarcerated in order to absolve him of guilt for the events that would follow, letting Kuroto step up to become CEO of Genm though, unbeknownst to him, his father was secretly using him to further his own goals.


Masamune Dan CEO

Masamune Dan as CEO of the Genm Corp.

Masamune was eventually released from prison, allowing him to retake control of the Genm Corp. He soon showed his true colors to the Kamen Riders, revealing that his incarceration and Kuroto's succession of him had all been part of his plan.

Masamune blackmailed Hiiro Kagami into turning to his side with Proto Drago Knight Hunter Z, which had his girlfriend, Saki Momose, sealed inside of it. After much reluctance, Hiiro accepted the offer and betrayed Emu and Kuroto and prevented them stopping the Pause ability of Cronus.

With Hiiro's assistance, Masamune revived Kiriya Kujo so he could become observant for the players of Kamen Rider Chronicle and prevent the doctors from stopping its progress. However, reviving Kiriya turned out to be Masamune's biggest mistake, as Kiriya revealed that his true purpose was to make an opening so Emu and Kuroto would create a new way to defeat him.

Cronus was later defeated by Ex-Aid Muteki Gamer. Angry at his defeat, Masamune forced Hiiro to control Taddle Legacy, threatening to kill Saki for good.

Final Battle

Following the failure of his scheme to use Gamedeus to instigate another global pandemic, Masamune finishes off Gamedeus and absorbs his remains into his body, turning himself into Gamedeus Cronus. However, the Riders all revert back to Level 1, allowing them to separate Masamune and Gamedeus, with Parado sacrificing himself to destroy the latter with the Doctor Mighty XX Gashat.

Masamune then fights against the Riders as Cronus. While holding his own at first, Cronus ends up being overwhelmed by the Riders once they switch to their Level 2 forms, with Emu delivering the final blow. Defeated, Masamune kills himself out of spite to prevent any of the eliminated players from being saved.

Kamen Rider Zi-O

In Kamen Rider Zi-O, due to the alterations of the timeline by the Time Jackers, Masamune Dan became just an ordinary CEO rather than the maniacal control freak he was in Kamen Rider Ex-Aid. He was killed in 2016 by Kuroto Dan so he could usurp his father's power.





  • Masamune Dan shares some similarities with Tenjuro Banno from Kamen Rider Drive. Both played a role in the creation of the villain factions of their respective series, are opposed by their own sons and are their series' true main antagonists. Both also possess massive god complexes, though Masamune is more composed for a villain in contrast to Banno's psychotic personality; although Masamune becomes more mentally unstable and paranoid than his own son after suffering his first defeat by Emu.
  • Masamune Dan's theme song as Kamen Rider Cronus is JUSTICE, which is sung by his actor, Hiroyuki Takami, who ironically also sings Kuroto Dan's theme song as Genm. It should also take into consideration that Hiroyuki Takami is the lead singer of a Japanese pop duo known as "access".


           Kamen Rider Ex-Aid Villains

Executives: Gamedeus | Parado | Graphite Bugster | Lovelica Bugster
Minor Bugsters: Salty Bugster | Alhambra Bugster | Revol Bugster | Motors Bugster | Gatton Bugster | Vernier Bugster | Kaiden Bugster | Charlie Bugster

Genm Corp.
Masamune Dan | Kuroto Dan | Ren Amagasaki | Hiiro Kagami

Next Genome Institute
Dr. Pac-Man | Soji Kuruse | Kazuhige Ryuzaki | Ageha Takeda | Saiko Yaotome

Foundation X
King Dark's Hologram | Kaisei Mogami
Beast Rider Squad: Kamen Rider Ouja | Kamen Rider Tiger | Kamen Rider Sasword | Kamen Rider Dark Kiva | Kamen Rider Beast

Machina Vision
Johnny Maxima | Kagenari Nagumo | Ninja-Players

Taiga Hanaya