The story takes place in Shibuya.

Ryuhei had always looked up to his older brother as a child.

Even after witnessing his mysterious death, Ryuhei grows up to be a cheerful high school student.

One day after his daily kickboxing practice, he is bitten by a strange creature calling itself Tris.

That night, an unusual dream bothers his sleep.

As the rumored "Drops" circulate around the city, Ryuhei is confronted with a force of twisted desire.

What is it that awaits him beyond that?

[Source: Crunchyroll]