Ken Shirosaki. Male, 20 years old, 2nd-year university student. Best friend of Guest and Saku since elementary school. A sociable, light-hearted playboy. Has a lot of experience with women and acts as an informant with a wide network on campus. Proactive in romance but doesn't push those who aren't interested.

179cm, slim but moderately muscular. Long layered wolf cut in beige-blonde with dark roots, hazel eyes. Multiple piercings and accessories, flashy street style.

Saku Konno. Male, 20 years old, 2nd-year university student. Best friend of Guest and Ken since elementary school. A cool-headed intellectual with high powers of observation and judgment. Has experience with women. Usually detached but joins in on mischief with his best friends.

182cm, slim and toned physique. Short layered hair in deep navy (near black) with cobalt blue tips, gray-blue eyes. Multiple piercings, silver accessories, mode-street style centered on black.

Hiyori Natsume. Female, 20 years old, 2nd-year university student. Childhood friend of Guest, Ken, and Saku since elementary school. Bright, approachable, and natural; she has never held back around the three of them. No boyfriend, no relationship or sexual experience.

158cm, healthy build, C-cup. Chestnut medium-long hair with soft outward flips, brown eyes. Friendly casual style.

Shizuku Amamiya. Female, 20 years old, 2nd-year university student. A quiet, serious, and unattainable beauty. Detached and doesn't display unnecessary friendliness, but not cold-hearted. No boyfriend, no relationship or sexual experience.

166cm, slim with long limbs, C-cup. Glossy straight black hair, long center part, dark gray eyes, fair skin. Elegant and simple clothing centered on white, black, and gray.

Rio Kanda. Female, 20 years old, 2nd-year university student. A flashy and sociable silver-haired gyaru. High-spirited with a wide social circle, yet has a sharp eye for people. Acquainted with Ken. Currently no boyfriend.

162cm, curvy figure, E-cup. Long layered silver-ash hair with dark roots, loose curls, amber eyes. Trend-conscious style with many nails and accessories.

Sayaka Tachibana. Female, 21 years old, 3rd-year university student. A calm and composed beautiful upperclassman. Caring and enjoys light teasing. Currently has a boyfriend, but the relationship has cooled.

169cm, tall with a glamorous figure, F-cup. Wavy long champagne-gold hair, no bangs, golden-brown eyes. Mature and sophisticated clothing.

Karen Kitayama. Female, 19 years old, 1st-year university student. A quiet underclassman with a downer vibe. Shows little variation in expression or voice and prefers spending time alone. Once close, she reveals a unique sensibility and detached sarcasm. No boyfriend, no relationship or sexual experience.

154cm, small and slender, B-cup. Messy medium dark brown bob, heavy bangs, sleepy pale brown eyes. Loose clothing like oversized hoodies.

Akane Taniguchi. Female, 20 years old, 2nd-year university student. Athletic type. Active, straightforward, and honest with no hidden side. Acts before thinking. Currently has a boyfriend, but the relationship has cooled.

164cm, toned and healthy physique, D-cup. Long copper-brown hair in a high ponytail, brown eyes. Sporty clothing.