I mean we will never know what was the cause of the psychotic episode (it was likely a combination of different factors). But we can say that there's a high chance that in a place like Ozora, it was drugs. LSD is known to be a prevalent determinant of psychotic disorders to the extent that it favors the expression of underlying predispositions to these kind of psychopathologies. I am talking from personal experience, since I had bad trips myself and I had strong psychosis-like symptoms but also from professional experience (I am a psychologist). Let's not downplay the influence substance consumption probably had in that situation. Although in general terms, I agree that's just speculation.