In a version of the universe, humanity as we know it will end. Jessica Poveda-Carretero sets humanity a challenge, a test, one which will either transform us into something better or replace us by something better.
Hoshiko Akiyama yearns for a sister her mother cannot provide, her dreams come true when she meets Akemi Fukui. When Akemi is killed in a subway bomb attack, Hoshiko is devastated. Years later she meets the mysterious Cashel Abram Hickson, his memories spanning the multiverse and countless lives. Cashel takes Hoshiko on a journey to discover a new truth, to change the past, and define our future.
In a battle of powerful minds, which version of the universe will prevail?