A hero instead of me

A history teacher named Hero sees mysterious Shadows and can travel between realities. He is not alone, there are a number of Flyers in these worlds who have similar abilities. Until recently, none of this mattered until the Doctor, as the Flyers call the leader of their movement, disappeared, and a war began to brew in all their realities at the same time, sweeping away everything in its path.

Meanwhile, somewhere in another corner of the universe, in Ukraine in 2041, Igor and his girlfriend Dasha arrive on an island. They have agreed to test an application based on artificial intelligence, although they have no idea what exactly they are testing and why everyone around them cannot tell about their own past.

Memory after memory, story after story, the heroes find each other and other realities, in order to finally realize who they are and why they ended up here.