GJ-bu (also known as GJ Club) is a club attended by Kyoya and the others.
- Mao Amatsuka - Leader
- Megumi Amatsuka - Member
- Shion Sumeragi - Member
- Kirara Bernstein - Member
- Kyōya Shinomiya - Member
- Tamaki Kannazuki - Member
This club has a tradition to forcibly take 1st year students and recruit him/her as a member. Known victims are Kyoya and Tamaki.
- If you looking carefully, at the left of Computer that usually Shion use for playing chess, there's a bookshelf with some Indonesian Title.
- And some book of that has a Indonesian's Name of Writer.
- The Book "Big Trik!" has 2 mixed language, English and Indonesian (Trik in Indonesia = Trick in English).
- If you noticed when Kyoya playing as a doctor, there's a box named "From Indonesia" (tough some letter covered by number), and a box named "Ada Apa Dengan Cinta".
- Ada Apa Dengan Cinta is a Indonesian Film released at February 14, 2002.
- Because of there's some Indonesian's Language Book and Box, some fan from Indonesians sometimes call this club as GaJe Klub / 'Klub Gak Jelas (read: Unclear Club or Club that not have particular activity).