High-Rise Invasion

Yuri Honjou, a 16-year-old girl, witnesses a gruesome attack and flees, only to become trapped in an abandoned building with mysterious locked doors. Her desperation to escape leads her to the rooftop, where she finds a desolate world surrounded by high-rise buildings with no signs of life. Upon learning that her brother is also trapped in this strange place, Yuri's priority shifts to finding him and escaping. However, she soon discovers she's not alone, and the masked assailants are a recurring threat.