Kamen Rider Zi-O S01 E15 Back to 2068

"The legacy of the Heisei Kamen Riders has carried on throughout the era. And now they pass their power on to the next generation! Rejoice, for the birth of a new king!"

Why does Sougo want to become a king in the first place? Sougo starts to tell Tsukuyomi about the continuous dreams he's been having. Just then, a giant event, just like the one in Sougo's dream, suddenly starts to manifest! A giant mecha suddenly appears in the sky! The demonic king's servant from the future, Kasshine suddenly appears! And thanks to Decade's intervention during their fight, Sougo gets blown 50 years into the future...!