Hearing that his friend Yosuke Tsumura had died, Shiro Okabe returned to Kyoto. He felt that Yusuke's wife, Yusuke Tsumura's former love Yuko, knew something about Yosuke's death, but he was unable to find out what she knew. Okabe investigates Yosuke's death, but someone kills the people who provide clues one after another. Okabe follows Rumi, a woman at a bar who was close to Yosuke, to Mt. Hiei, and to his surprise learns that Yosuke is still alive.
