Primary

• Shidou Itsuka Brother of Mana Takamiya
• Shidou Itsuka In love with Tohka Yatogami
• Shidou Itsuka In love with Origami Tobiichi

Extended

• Origami Tobiichi classmate of Shidou Itsuka
• Origami Tobiichi In love with Shidou Itsuka
• Origami Tobiichi Enemy of Kurumi Tokisaki
• Origami Tobiichi Enemy of Tohka Yatogami
• Origami Tobiichi Enemy of Yoshino Himekawa
• Origami Tobiichi Teammate of Mana Takamiya
• Tohka Yatogami In love with Shidou Itsuka
• Tohka Yatogami Enemy of Kurumi Tokisaki
• Tohka Yatogami Rival of Origami Tobiichi
• Tohka Yatogami Friend of Kaguya Yamai
• Tohka Yatogami Friend of Yuzuru Yamai
• Tohka Yatogami Enemy of Ellen Mira Mathers
• Mana Takamiya Sister of Shidou Itsuka
• Mana Takamiya Enemy of Kurumi Tokisaki
• Mana Takamiya Teammate of Origami Tobiichi
• Mana Takamiya Rival of Kotori Itsuka