Another major mystery is whether Kamen Rider MY-TH is actually the first person to use these powers. Strange references, forgotten records, unexplained equipment, or characters who recognize MY-TH could indicate that previous Riders existed.

If earlier Riders existed, the obvious question becomes what happened to them. Were they killed, did they disappear, or did they deliberately erase themselves from history? Their fate could provide important clues about the danger surrounding MY-TH.