Arisa Vol 5

From the Kodansha edition

Just when Tsubasa is getting close to understanding what happened to her twin sister Arisa, the King's power falls into the hands of Shizuka, newly returned to school after being the first victim of the first King of Class 2B. The first King was Arisa, so Shizuka turns the King's power on Tsubasa, believing her to be Arisa.

Source: OpenLibrary