which is the cannonical smt 3 ending

For SMT 3 / Nocturne , there isn’t an officially confirmed single “canonical” ending. The fan consensus is that the True Demon Ending is the closest thing to canon, but Atlus has never cleanly labeled one ending as the definitive story route.

Why people say True Demon

• It’s the most content-rich ending and is often treated as the “main” route by fans.

• Later Megaten references and spin-offs have led some players to read it as the most likely timeline.

The safe answer

• Officially: no single canon ending is confirmed.

• Common fan pick: True Demon Ending.

Quick note

If you mean which ending the community treats as canon , the answer is usually True Demon. If you mean what Atlus has explicitly stated , the answer is none.

TL;DR: No official canon ending; True Demon is the fan-favored one.