Tenchu: Wrath of Heaven

After Lord Mei-Oh was defeated in Tenchu: Stealth Assassins, Rikimaru was left in Lord Mei-Oh's fortress carrying a giant boulder to provide an escape route for Ayame and Princess Kiku. He appears to be trapped and left for dead. Ayame stuck Rikimaru's sword, "Izayoi" (he is seen drawing this sword in the opening CG of Wrath of Heaven) in snow as a monument for her fellow ninja, now considered dead. A year later, Rikimaru reports to Lord Gohda that he has managed to survive this near-death experience; unbeknownst to them, the real Rikimaru is trapped in the 20th century trying to find a way back to their time.