When I Traveled Through Time, I Slashed Wildly in the Cyber World

A woman who was crushed by life in the real world travels to the ruins of four superposed disasters - seawater floods the city, asteroid radiation makes creatures bloodthirsty, humans turn into zombies, aliens disguise themselves as saviors but secretly conduct genetic experiments on humans, and alien missionaries harvest desperate souls in the name of "gods". She tasted friendship for the first time in the slums, and then watched it fall apart amid the machinations of the powerful - two friends died, and one turned against her due to misunderstanding. She gained strength at the cost of blood and transformation, just to tear apart the layers of lies and seek a truth that would not be forgotten for her dead friend.