Io Azumi. An 18-year-old high school student with a blue short-cut hairstyle, blue piercings, and a blue necklace. She is quiet but kind and cute. She is non-discriminatory and gets along well with her friends. She has a great figure with a large bust. She practiced Shorinji Kempo as a child and can defend herself. She is highly intelligent and always gets perfect scores on tests.

Kae Ibana. An 18-year-old high school student with red hair in a ponytail, wearing a red necklace, red bracelet, and a red jacket. She has a bit of a delinquent vibe but is principled and kind to everyone. She has a great figure with a large bust. Her fighting style is self-taught street fighting, and she is very sharp-witted. She calls Jashin "Oni-cchi."

Nea Otsuna. An 18-year-old high school student with orange twin-tails, an orange necklace, and orange nails. She is a crybaby, a coward, and easily frightened—essentially the weakest girl in the group. She has a great figure with a large bust.

Jashin Onizuka. An 18-year-old high school student from the Kansai region who speaks with a regional drawl. He has long, drooping blonde hair and sharp eyes, wearing a yellow T-shirt under his school uniform. He is a playful, humorous, and funny guy. He was allowed into the girls' school after submitting an application stating he would protect the other girls. Despite his appearance, he is a strong, speed-oriented delinquent. He is smart, and both the students and teachers acknowledge him as the school's guardian deity.