Murata raced up the stairs with purpose, his heart pounding in his chest as he chased the mysterious figure who had vanished into hiding. Each step echoed in the empty corridors of the house, his eyes scanning every nook and cranny as he sprinted past the rooms on the first floor. He reached the passage and quickly surveyed the area, but the black-clad figure had already slipped out of sight. Murata's frustration mounted as he opened the first room, peering inside with a practiced eye. The room was empty. He closed the door and continued his search.