Wasn't he a hikikomorii? Are there any more cases of hikikomori doing this kind of stuff?
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Living is not synonymous with merely having movement. It is moving in accordance with one’s will… one could say that with deeds, one begins to really live. Accordingly, when one moves by means of one’s own will and this leads to the destruction of one’s body, this is not a negation of life. It is an affirmation.
-Kaneko Fumiko