With the Master Gashat in hand, Masamune transforms into Kamen Rider Cronus. As CR faces off against the high tier Bugsters to clear Kamen Rider Chronicle, Masamune made his presence and reveals himself as the true mastermind of the events that have unfolded. Months after his son's death, Masamune was released from prison and reassumed his role as CEO of Genm Corp., much to Ren Amagasaki's disappointment. I am the CEO.' ―Masamune's proclamation to the Riders and Bugsters. 'Kuroto's talents and the Bugsters' powers are nothing more than products of Genm Corp. Masamune reveals himself as the true mastermind of the Bugster threat. He also requested Emu to stop his son's sinister plans. Masamune revealed to him how he was truly disappointed by his son's actions and informed everything he told Kiriya. Later that same day, Emu Hojo and Asuna Karino went to visit him.

Despite telling the detective everything he could answer, Uesugi suddenly developed symptoms of Game Illness right after. One day, a detective named Heiji Uesugi visited Masamune and questioned him regarding Zero Day as both Kuroto Dan and Kiriya Kujo had gone missing. While Kiriya intended to share his findings with his allies, this led to his death at the hands of Genm Zombie Gamer Level X, who was his own corrupted son. He would later give the information about the truth of Zero Day to Kiriya. In Christmas Day 2016, Masamune Dan was visited by Kiriya Kujo in his prison. to further conceptualize Kamen Rider Chronicle, while unknowingly becoming a pawn to his father's goals. In his place, Kuroto would step up to become CEO of Genm Corp. A few years later, Kuroto enacted Zero Day and Masamune allowed himself to be incarcerated to absolve him of guilt for the events that would follow. Unbeknownst to everyone, Masamune would infect himself with the virus to develop an ultimate antibody. Sixteen years ago, during the Y2K crisis, he was alerted by Kuroto of the first instance of the Bugster virus on his son's laptop. Masamune Dan was the original president of Genm Corp., the husband to Sakurako Dan, and the father of Kuroto. Masamune during his time as CEO of Genm Corp.

1.6 Kamen Rider Ex-Aid Trilogy: Another Ending.

Kamen rider ex aid flash belt