Sorry for the late reply! to get to the 'True' Ending. << Spoiler >>
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- Make sure you play the 'PostJam' version
- You need to finished with both regular ending first. ("Murderer" and "Hopeless")
- after either of the ending you got. You will meet Noir again. There's new conversation choice for you there!
- Brace yourself to confront Claire one more time!