D_Cide Traumerei the Animation

Ryuuhei Oda has never forgotten the mysterious death of his older brother or the strange mark left near his body. Years later, he lives as an energetic high school student devoted to kickboxing until a peculiar creature bites him and triggers a distorted dream filled with unnatural beings. The nightmare soon begins spilling into reality, and Ryuuhei discovers that he can transform into a fighter capable of confronting monsters from the dream world. As the mysterious Drops spread twisted desires through Shibuya and new allies reveal that they know more than they say, the mark tied to his brother's death appears again. Protecting the city becomes inseparable from uncovering the truth that has followed him since childhood.