Shinobumonogatari __top__ -

And as she passed, the old bell rang once.

: The story heavily involves Deathtopia Virtuoso Suicide-Master , the legendary vampire who was Kiss-Shot's original master.

As the subtitle ("Death Regards the Girl Who Leapt Through Time") suggests, time is a central theme. Araragi is moving forward in time (growing up), while Shinobu is a timeless entity looking back. The volume contrasts the linear progression of Araragi’s life with the cyclical, stagnant history of the vampire. shinobumonogatari

For the first time, Hotaru smiled. It was a terrible smile—a hole in a face.

He stood. The Heart Cutter whispered against its scabbard. And as she passed, the old bell rang once

Because in that clatter, Kirei had moved. Not toward him. Toward the jar of ash she had hidden in her sleeve—Genzō’s remains.

“Fight me,” he said. “Not to win. To remember.” Araragi is moving forward in time (growing up),

Shinobumonogatari emphasizes that Shinobu is essentially starting a "second life" through her bond with Araragi. The tragedy of her past (the loss of her first minion) is juxtaposed with the hope of her present situation. It reinforces the idea that Araragi saved her not just physically, but emotionally.