On the roof of a high-rise building, a young girl named Yuri witnesses a masked figure split a man's head open with an axe! It's not exactly an everyday occurrence for a high schooler, but things only get weirder from there. Yuri soon finds herself in a strange world of skyscrapers with only two options for escape—fight past the mysterious masked figures or leap to her death!
Miura and Ōba launched the manga on DeNA's Manga Box app in December 2013. Kodansha published the manga's 19th compiled book volume on January 9. Seven Seas Entertainment published the manga's third omnibus volume on December 31. Latest chapters of the manga are also available in English digitally on Manga Box's English website.
Source: Manga Box app