About a year ago, Mika Shibata's youngest son returned home and walked upstairs without saying a word. He hasn't come out of the room yet. The 26 year old sleeps during the day and wakes up at night. His mother provided him with food and shelter, hoping that he could come out of this state. But she was worried that he would never come out. "The longer he stays in this state, the more difficult it is for him to return to society," she said.<br>
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