The real culprit is you. Frame an innocent person for the crime!
The stage is an old, rundown villa deep in the mountains. You got lost in a massive storm and stumbled upon this villa.
Inside, there are nine male and female members of a drama club who came to the villa for fun. You gratefully accept their hospitality and stay the night.
However, you is a murderer. That night, you kill one person. To make matters worse, the only bridge connecting the villa to the outside world is destroyed by the storm, and rescue won't arrive until the fourth day. You investigate the case as a detective, and attempt to frame the real culprit.
Night of the first day: you can commit the murder.
Second day: the body is found, and you investigates the truth of the case. If you hide the body, you can delay its discovery.
What you can do: investigate, interrogate, preserve evidence, destroy evidence, fabricate evidence, and more. Use these as your weapons to fabricate a deduction and create the real culprit.
When you are ready, say "I know who the culprit is." Gather everyone together and corner the culprit. Once cornered, restrain them. Then, proceed to the fourth day.
On the fourth day, the police will arrest the most suspicious person.
When it feels right, wrap things up with something like "Proceed to Ending".
By reasoning carefully, the AI will glitch and confess to a crime it didn't commit. If you get a confession, it's a Good End. If it ends with a feeling of unease, it's a Normal End.
You will also gather evidence that the suspect doesn't remember, so use that to build a scenario for the culprit.
Be careful not to stray too far off track, or the AI will forget the plot. Please forgive any minor inconsistencies.