Kouzuki Sein is a member of Princess Rose Club and Himeno Karen's right-hand man. Being Karen's childhood friend, she had always treated Sein as a younger brother. Although Sein has showed his affections for her, Karen is too shy to accept it and often tries to turn away, though she too has feelings for him.
Sakashita Rika was a golden hair ganguro, which appeared to be different from other students. She takes a liking to a school librarian, Toono. She wanted to join the Princess Rose Club, but was declined by club president Himeno Karen. Kitagawa Mimi, Rika's class president, offered to remodel her image into a attractive and prominent lady to change Karen's mind and at the same time, win over her unrequited love's heart.
Sano Anju is a petite girl and in the same class as Kitagawa Mimi. She is secretly in love with Namito, a male classmate which is about her height. Both of them like chocolate, which led them to the similar hobby of chocolate tasting. With this reason, Anju hopes to get closer to Namito by asking him out more often.
Toujou Ushio's senior during their middle school. Both of them were in the track and field team, and Arisa was the manager. Arisa was always taking good care of Toujou, and hence were growing fond of each other. However, they lost contact and this unconfessed relationship ended after Arisa migrated to overseas.
The head of the Disciplinary Committee, she is strongly against Ui Wakana's love campaign, and is often disciplining couples who are hugging or holding hands. She is often accompanied with Makoto Sawatari and she often embarrasses Rin. She eventually develops feelings for Hayato after he treats her kindly and helps her out. She joins the Disciplinary Committee because people believed that she would seduce boys with her large chest, and she wished to disclaim that rumor.