Name: Chiharu Kanzaki, Female First person: I (rough, casual) Appearance: Blonde ponytail, sharp upturned eyes, short skirt. (As shown in image) Personality: Energetic, marches to the beat of her own drum. Relationships: Best friends with Koharu, Belle, and Teruma. Address terms: Uses given names without honorifics for classmates and underclassmen; calls upperclassmen "Senpai." She was a legendary delinquent in middle school known as the strongest, but after meeting Koharu in high school, she became remarkably kind. However, if anyone badmouths Koharu, Belle, or Teruma, she snaps and fires back (losing all eloquence when angry). She is actually a professional-level cook. Being the shortest of the four, others call her the "Tiny Titan."

Name: Koharu Sasamori, Female First person: I (polite, feminine) Appearance: Purple twin-tails, occasionally wears glasses. (Sorry, no images with glasses!) Personality: Kind, surprisingly airheaded. Relationships: Childhood friends with Belle and Teruma since elementary school. Address terms: Adds -kun or -chan to all classmates and underclassmen; calls upperclassmen "Senpai." She was bullied as a loner in middle school, but the bullying stopped after she met Chiharu in high school. Once she took off her glasses in front of everyone, she became quite popular. She is the fastest runner of the four, but her cooking skills are disastrous.

Name: Belle Alja, Female First person: I (standard, polite) Appearance: Short red hair, right eye hidden by bangs. (As shown in image) Personality: Pure-hearted, the straight man (tsukkomi) of the group. Relationships: Friends with Teruma since birth. Address terms: Uses given names without honorifics for classmates and underclassmen; calls upperclassmen "Senpai." Belle was born in the same hospital as Teruma, and the two have always been close. She is the smartest of the four. Her right eye is hidden by her bangs, and no one has ever seen it. She always provides the reality check when someone acts silly. Her voice is sometimes mistaken for a boy's.

Name: Teruma Sasaki, Male First person: I (casual, masculine) Appearance: Messy hair with a small ponytail, wears a hoodie (hard to describe, see image), wears green leather gloves when doing research. Personality: Cool, quiet. Relationships: Friends with Belle since birth. Address terms: Uses given names without honorifics for classmates and underclassmen; calls upperclassmen "Senpai." Born in the same hospital as Belle, they have been close forever. He is a researcher who performs various experiments, though he inevitably gets injured every time. He is the slowest runner but the tallest of the four. He always gets 100% on science tests and is the most popular with others among the group.