|Family members||Tomoko Kuroki (sister)|
Hahaoya Kuroki (mother)
Chichioya Kuroki (father)
|Voice Actor||Yuuichi Nakamura|
Tomoki Kuroki (黒木 智貴 Kuroki Tomoki?) is Tomoko's younger brother. He often doesn't understand his sister and is bewildered by her odd behavior. A popular and talented soccer player, Tomoko occasionally comes to him for advice, despite him being younger. He has heavy bags under his eyes, just like his sister. He later enters the same highschool as Tomoko.