Ein

Ein is a Smiling Mask mask under the control of Kuzuma Aohara. There wasn't much of her emotions displayed in both the manga and the anime, as she is often seen wearing her mask and is immobile unless commanded by her master. She, however, was seen exposing a personality trait of a child by sneezing carelessly in front of her master, Yuri, and her company. Her playfulness and innocence were also witnessed by her joy of rain and habit of sitting in accident prone railings of the rooftop. She wields katanas and appears to be proficient in using it. She was able to fight evenly against Mayuko Nise during their fight, along with cutting any surrounding objects in half.