What Yumi is exhibiting is hallucinations. A person who is hallucinating would have experiences in their minds that they would perceive to be real even though they are not. These thoughts are only created by the mind.
For example, a person who is hallucinating may appear to hear voices or see things that are not real or existent.
Hallucination is one symptom of schizophrenia. Schizophrenia is a type of illness where those who suffer from it interpret and say things that are out of reality.
From the question we have here, Yumi is seeing things and making claims that are out of reality. He is seeing things that do not even exist. Like the claims he is making about aliens and the law enforcement agents.
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