|Family||Megumi Sakai (mother)
Hisashi Sakai (father)
Tomoki Sakai (brother)
|Live Action||Junya Ikeda|
Hiroya Sakai (Japanese: 坂井 弘也, Sakai Hiroya) is the younger brother of Tomoki Sakai.
Hiroya has black hair and dark blue eyes.
Although Hiroya is 11 months younger than Tomoki Sakai, they are in the same year of middle school and they are mean to each other often.
Miu is Hiroya's crush who is now his girlfriend.
- The name Hiroya means "vast, broad, wide" (弘) (hiro) and "to be, also" (也) (ya).
- Hiroya's surname Sakai means "slope, hill" (坂) (saka) and "well, mine shaft, pit" (井) (i).
- Hiroya likes river fishing.