The Ribbon That Binds is the 11th chapter of the Rurouni Kenshin manga.
Learning this from Sano, Kaoru runs to Kenshin. She gives him her favorite indigo blue ribbon, telling him to come back to her once he has dealt with Jin-e. Right in front of Kenshin, she is then kidnapped by Jin-e, who flees in a boat. Kenshin yells his enemy's name in anger as Kaoru is taken away from him.