Episode 15: Back to 2068 +
Episode 15.5: Be Forever Complementation Project (Part One)
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 but just then, a giant mecha suddenly appears in the sky! The demonic king’s servant from the future, Kasshin suddenly appears! And thanks to Decade’s intervention during their fight, Sougo gets blown 50 years into the future…!