My cancer won guys

Future humanity launches a major invasion to reclaim Earth from a zombie plague. During chaos, a girl in a distant future can swap bodies between the past and the future to uncover the truth behind leaving Earth.
Meanwhile, Viola, a girl desperate to be cured of cancer, finds a mysterious cube. As they investigate the origin of the zombie plague and the mysterious technology found, they realize that the dark forest and uncanny valley are much more real than their filthy dreams.