A man is looking up at the third-floor apartment where Shiori Kishimoto and her husband Kiyoshi live. …Hiroshi Kishimoto. To Shiori, he's her brother-in-law. After confirming that she's hanging laundry, Hiroshi slips into the apartment. He arrives at the third floor and puts his hand on the door of the room where his younger brother and sister-in-law live… The door is locked. Quickly returning to the emergency staircase, he climbs down the outer wall and reaches the balcony window. At this time, Hiroshi knows that Shiori is usually alone...
