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Later on, she passed by Kaneki and Rize Kamishiro while they were on their date and stopped to glance at the two.
She did not want to sadden Kaneki, and without warning, one of Suzuya's was lodged into her shoulder.
Touka stepped in and declared that the place was not Nishiki's feeding ground, but Rize Kamishiro's.
Having this defining moment makes Touka a pretty solid candidate as a protagonist.
After they reached a safe area, Ayato declared to Touka and Yomo that he knew who they were.