This reminds me about old copypaste:
-Haruko, child of viral, travels back in time following the space/time rift created by GARLOCK in an attempt to discover the source of the spiral power in humans. She is pursued by the interdimentional government aka medical mechanica, who attempts to stop her.
-During this attempt she frees Atomsk, aka lilith, who was imprisoned to contain its enormous spiral power. this results in the second impact.
-during the ensuing years the surviving human population endures relentless assault from the intradimentional goverment, who attempts to recover and contain the raw spiral power of lilith.
-After the third impact and destruction of humanity as we know it, the spiral power of the being formerly known as atomsk was dispersed into raw potential.
-Using the spiral potential, the lone survivors of the final impact, recolonize earth within 7 years, and soon begin their journey into space.
-Still recovering from their loss in the final impact, the interdimentional government is unable to stop them until a considerable time later.