High-Rise Invasion v01-v21 (2018-2021) Complete

English translation of the Japanese manga Tenkuu Shinpan (天空侵犯).
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!