Trust = 信頼
Existence = 存在感
From this research (Yong 2008), with 168 cases being observed or interviewed, "Coping", "Trust" and "Existence" appeared strongly as the basic elements of what the hikikomories think.
During the process of categorising and conceptualizing the obtained data, coping difficulties seemed to dominate the feelings and claims behind what was being coded and being grouped into categories. The repeated message seemed to be, "I can't cope!"
Some see "me" as the main cause of blame, e.g. "I am a defective product", it is "my" weak personality that had made "me" unable to keep up with the competitive market demands. Some see that it is all about "others" that had forced him/her into hikiomori, for instance "The world is too harsh", "I am overloaded". However in some cases, both "me" and "not-me" probably had the same weight.
The issue of "trust" was developed from both elements of "fear" and "disappointment". Being able or unable of trust, could be driven from fear and disappointment from past experience.
The "concept of time", feelings of "dissatisfaction" of hikikomori situation, and "death thoughts" questioned the "existence" of hikikomori.