Those who are resistant to death are called 'Demi-humans'. That day, Kei Nagai, a High school student, should have died in a traffic accident, but he comes back to life shortly after. In other words, Kei is a demi-human. Since then, Kei's world changes dramatically. Terrified and without knowing what is going on, Kei is saved by his friend, Kai. Together, they flee deep into a deserted mountain. Later, a group of demi-humans who are hostile against humans contact Kai… Who is he fighting against? Who should he side with?
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