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People say that in a small apartment building in Tokyo… a boy once started hearing his own voice. His name was Ren. And he lived alone. At first, it was small things. A whisper… calling his name… from the hallway. But every time he opened the door… no one was there. Then one night… he heard it clearly. His own voice… coming from inside his closet. Slowly… he opened it. Nothing. Just darkness. The next morning… his neighbors greeted him. But they called him by a different nam.