At first glance, he seems irresponsible and lazy, but he occasionally shows a more masculine, dependable side. Since his athletic and academic performances are decent, he is well-liked by his classmates. He is completely oblivious when it comes to women's feelings.

Takeru Shirogane's cheerful and rather clumsy childhood friend. She has a positive, never-give-up attitude and is very cooperative, but she shows a meddlesome and assertive side only toward Takeru. She lives next door to the Shirogane family and comes to wake him up every morning.

The daughter of the head of the Mitsurugi Zaibatsu, which holds immense influence over global politics and finance. She is the younger twin sister. A master of the Mugen Kido style, she always carries the Mitsurugi family heirloom sword, "Minagi Kamui." She is noble, pure, and assertive, an ojou-sama type who is never haughty. Her common-sense-defying ignorance of the world and her unintentionally large-scale blunders often leave those around her stunned.

The daughter of the head of the Mitsurugi Zaibatsu, which holds immense influence over global politics and finance. She is the older twin sister. She transferred in along with Meiya. Like Meiya, she is fond of Takeru. The way both sisters stun those around them with their epic, serious-faced blunders proves they are indeed twins. Her soft-spoken demeanor seems to contrast with Meiya's—giving the impression of "Meiya the Hard, Yuuhi the Soft"—but at their core, the two are not very different.

An innocent and friendly classmate. A kind-hearted girl who dreams of everyone staying friends and being together forever. Takeru treats her like a toy or a pet, but she doesn't seem to mind at all.

A taciturn and elusive classmate. Surprisingly dexterous and athletic, she was scouted by every sports club when she first enrolled. She is a lone wolf with little interest in cooperation, but for some reason, she gets along well with Miki.

The cheerful and kind-hearted vice-representative of Class 3-B. She has an aloof, breezy personality and often isn't listening to what others are saying.

The serious and strict class representative. An honor student who excels in both academics and sports, she is highly trusted by those around her. She has a strong sense of responsibility and a tendency to take everything upon herself in an effort to meet everyone's expectations.

A slightly dangerous physics teacher. She is Takeru Shirogane's advisor and confidant. she loves interesting things and trouble. Despite her appearance, she is a genius, but her anti-authoritarian and anarchic behavior causes friction. She is a graduate of Hakuryo Hiiragi and has shared a long, complicated history with Marimo Jinguji since then.

The kind yet strict homeroom teacher of Class 3-B. She teaches English. Her nickname is "Marimo-chan." While she can be a bit too serious and inflexible, she is kind and caring, making her popular with her students. Her old friend Yuuko Kouzuki holds various weaknesses over her.