6 ideas
Saitō defines hikikomori as withdrawal into one's home for six months or longer, with no participation in society, beginning by the late twenties, where the withdrawal is not better explained by another psychiatric disorder. He treats it as a condition or state of being rather than a disease, so it can be named and addressed without pathologizing the person or waiting for a diagnostic label.
Saitō models the individual, family and society as three circles. In healthy functioning they overlap, and each keeps the others in check. In hikikomori the circles detach: the youth retreats from the family, and the family hides the problem from society. Each circle then feeds its own stress back into itself, so the withdrawal sustains itself and no single part can break the loop alone.
Whatever triggered the withdrawal, prolonged isolation itself produces secondary symptoms such as anxiety, obsessive behavior, day-night reversal, regression and domestic violence. These symptoms make re-entry feel even more impossible. The longer the state lasts, the more the cause becomes the withdrawal itself, which is why early intervention matters more than finding the original reason.
Parents, especially in a culture that prizes appearances, tend to conceal a withdrawn child and quietly provide indefinite support. That concealment cuts the family off from outside help.
Because the withdrawn person usually refuses to seek help, Saitō begins treatment with the parents. They attend consultations, join family groups and change how they communicate. The steps run from stabilizing the home, to rebuilding dialogue with the child, to eventually bringing the youth into clinical contact and then peer group settings. The aim is to re-link the family circle to society first.
Saitō reads hikikomori as an adolescence that never concludes. The young person stays suspended in a moratorium, avoiding the confrontation with limits and imperfection that adulthood requires. Seen this way, the withdrawal protects the fantasy of unrealized potential from the risk of being tested and judged, rather than showing simple laziness or weakness.