|Hair||, Ahoge, Blond, Brown, Curtained, Parted in Middle, Short|
|Body||, Average Height, Pale, Slim, Teen|
|Clothes||, Jacket, Necktie, School Uniform, Shirt, Trousers|
|Personality||, Arrogant, Confident, Rude, Shy, Smart|
|Role||, Antagonist, High School Student, Honor Student, Shinigami|
|Visual novels||Side character - Re:Birthday Song ~Koi o Utau Shinigami~|
|Voiced by||Nishida Masakazu|
A student with excellent grades, Hiiro has absolute confidence in himself. For some reason, he treats the supplementary group members hostilely; egging them on and getting in their way. Hiiro has a mean-spirited personality.