As is the case of Aku no Hana, Shuzo Oshimi doesn't understand his main characters, but he depicts and captures the atmosphere, the "mana" that these characters emanate so accurately, that the truths flow seamlessly from the expressionistic lines he draws. He doesn't understand, but he knows he doesn't, so he won't even try to explain, but simply becomes one with the characters and sees the world in their utterly subjective mode. Factually, there are some psychiatrists in the manga that express the opinions and understanding of the author regarding human psychology, but it is plainly observable that they're all but one facet of a deeply complex and nuanced subject from what is drawn so vividly by the author, and from the script. The manga literally strips your soul from your body and forces it to be the subjects of the main characters, to the point that from time to time the sense of reality becomes hazy. The manga is only to be experienced, not to be understood, and I suspect that when Oshimi was working on this one, he, too, only experienced the manga, never understood what he was really creating.