I’m not sure if the game intended this to be a mystery or not. In the actual Honnouji scene, the narration and Hideyoshi and Mitsuhide’s reaction strongly implies that Nobunaga really was dead, even though it didn’t explicitly show that he dropped dead.
Still, "Nobunaga’s corpse was never found” was a saying that’s bandied about a lot online, leading to conspiracy theories about how he might have escaped or if someone secretly removed his body.
However, some experts claim that the corpse is not missing. It’s just “unidentifiable”. There are so many dead in Honnouji, and not to mention that the building burned down. It’s only logical to assume that nobody could identify which among the piles of dead bodies was supposed to be Nobunaga. Even in modern day, with all its high-end forensic technology, it’s still not easy to identify burnt corpses.
The account by Luis Frois also assumed as such, and he said that Nobunaga’s remains was burnt up and nothing of him is left. He wasn’t there in the Honnouji premises to actually poke around the ashes, but he was in the church in Kyoto, which was close enough for him to have witnessed the fire.
I think there is the flimsiest chance that Nobunaga could really have just pretended to be dead, and then ran off into the sunset to live the rest of his life in peace. With so many people running around in Honnouji that night, who’s to say that he did not mingle with the escaping servants, and slip out? If you really want to play conspiracy games, might as well just say he’s not dead and just vanished.
There’s no reason to conspire overly-complicated explanations about how “he did die, but the body had been taken” or some such, though. Fire just burn things up, and without technology, burnt bodies are just simply unidentifiable.









