D_Cide Traumerei the Animation (2021)

S1E1 Awakening

As a child, Ryuhei looked up to his older brother, who was beloved and gentle. However, after his brother's enigmatic death, Ryuhei has grown into a spirited high school student, seemingly oblivious to the darkness that surrounds him. One night, after being bitten by a strange creature named Tris, he experiences a peculiar dream where a group of teenagers in black confront a bizarre monster. Caught in a bewildering situation, Ryuhei ultimately encounters the creature for real in the bustling streets of Shibuya.