The story takes place in Shibuya.<br>
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Ryuuhei had always looked up to his older brother as a child. Even after witnessing his mysterious death, Ryuuhei 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, Ryuuhei is confronted with a force of twisted desire. What is it that awaits him beyond that?<br>
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(Source: Crunchyroll)