Kanankaori is cosplaying as Mayoi Hachikuji from Bakemonogatari. Bakemonogatari is a Japanese light novel series written by Japanese novelist Nisio Isin and illustrated by Taiwanese illustrator Vofan; the series is published by Kodansha under the Kodansha Box imprint. The story centers on Koyomi Araragi, a third year high school student who has recently survived a vampire attack, and finds himself mixed up with all kinds of apparitions; gods, ghosts, mythological beasts, and spirits. An anime adaptation by Shaft started airing on July 3, 2009 and went through a total of 15 episodes. The prequel novel, Kizumonogatari was recently announced as being green-lit for anime production.
Mayoi, the main character of Mayoi Snail, is the ghost of a fifth-grade elementary school girl. She was killed in a traffic accident while trying to reach her mother's home, and has since unsuccessfully attempted to do so. She can only be seen by people who do not want to reach their destination. Koyomi met her in a park on Mother's Day and offered to help her find her mother's home. She makes a lot of spelling mistakes and has a habit of mispronouncing Koyomi's family name. Her family name before her parents got divorced was Tsunade She graduates to become a "Wandering Spirit" after Koyomi and Hitagi help her reach her destination. In Mayoi Jiangshi, Koyomi and Shinobu accidentally travels back in time 11 years ago, a day before Mayoi's death. Koyomi, wanting to prevent Mayoi from turning into a wandering spirit, helps her travel to her mother's house. After they returned to the present, they found out the whole town being infested with zombies. In this history, Koyomi has not met Mayoi, so in the events of Tsubasa Cat, he didn't get the information on Shinobu, or went near Mister Donuts - so Black Hanekawa killed him, causing this timeline's Shinobu to vow to destroy the world and make zombie vampires, or 'Jiangshi'. On a search for a power spot, Koyomi and Shinobu manage to attract the zombies but managed to be saved by a grown Hachikuji. It seems that Mayoi was not happy that she became a spirit, but was happy that as a spirit, she was able to meet Koyomi. Koyomi also stated that he's the happiest when talking to Mayoi.