The Black Maw?

Lillian zigzagged through the crowd of commuting students, her face twitching. How was she going to find Marionette in such a crowded place?

Of course, such a problem could only be solved by that troublesome accessory around her neck.

While Lillian was pushing through the crowd, she felt someone accidentally push her over, causing her to stumble forward.

After regaining her balance, she found herself at a stall that sold weapons.

Weapons of various lengths. Weapons of various widths. Weapons that were either sharp or dull.

This was the very same stall where she had bought her rapier—the Sonata of Revenge. But it seemed that the trader who manned this stall had either undergone a rapid transformation or had decided to leave it to a trustworthy partner.