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Global catastrophe has changed the life of mankind to the core and let out from the shelters of the istots, which used to be considered only characters of legends. People are forced to fight them for territory. Is someone who is not like you always an enemy? And what differentiates a human from a "non-human"?

A young scientist who studies magical artefacts in order to find a recipe for remedies for his blind sister... A veterinary doctor who knows how to look after deadly creatures... An officer with a broken share, who falls in love with chudovisky... And a charming aosagibi from the distant islands of Yamato.

They say that this bird brings good luck to the one who owns it. But does luck always take such forms as we expect it to?