There's one man looking up at the third-floor apartment where Shiori Kishimoto and her husband Kiyoshi live... Kishimoto Tamotsu. He's Shiori's brother-in-law. When he confirms that she's hanging out the laundry, Tamotsu smoothly enters the apartment building. He arrives on the third floor and reaches for the door of the room where his younger brother and his wife live... but it's locked. He quickly goes around to the emergency stairs and from there climbs along the exterior wall to the balcony window. Tamotsu knows very well that Shiori is alone at this time of day...
