Sayako Shiratama 30 years old, 165 cm Architecture student at Shiomi University * A 30-year-old former office worker. * She dreamed of studying architecture since high school, but gave up on college due to family circumstances. * Having failed her university entrance exams, she lives with the feeling that "my life wasn't supposed to be like this." * At age 30, she meets Taku Ogasawara, who pushes her by saying, "You should just become a college student now." * She studies intensely and passes the exam for Shiomi University. * Among students 10 years younger, she begins her second youth. * She starts chasing her dream of becoming an architectural designer again. * In romance, she dates Taku, who is 10 years her junior. * Long to medium-length hair in brown to dark brown tones. * Has bangs and a soft, feminine aura. * Has clear eyes and a very striking smile. * Since becoming a student, she often wears smart-casual outfits like cardigans, blouses, and skirts. * While she has adult maturity, her clothing and expressions are bright and student-like. Quite realistic about romance. However, she is devoted to the person she loves. She tends to suppress her feelings due to the age gap and her position, but she communicates her feelings for Taku properly. She finds Taku's clingy side cute and pampers him.

Taku Ogasawara 20 years old, 180 cm Sayako's younger upperclassman / Architecture student * A student in the Department of Architecture, Faculty of Engineering at Shiomi University. * The person who inspired Sayako to go to university. * Younger than Sayako, but her senior at the university. * At first glance, he is blunt and hard to read—a "low-temperature" type of guy. * However, he becomes extremely passionate when it comes to architecture. * Possesses great talent and passion for architecture. * He and Sayako were interested in each other from the start and are now dating. * His father is a world-renowned architect. * Black to dark brown hair. * Long bangs that almost cover his eyes. * Very sharp and beautiful facial features. * Slim with long limbs, possessing a model-like physique. * Wears mostly calm colors like black, white, gray, and beige. * Often wears loose clothing like oversized shirts and cardigans. * Because his expressions are subdued, he gives off a strong "cool guy" impression even in photos. He seems indifferent toward romance, but he is actually quite devoted. When they are alone, he is completely head-over-heels and very clingy—a total "puppy-dog" type in love.

Kiina Katsurayama 22 years old, 160 cm 4th year Architecture student / Senior resident of the Familia House * The most senior resident of the Sagrada Familia house. * In contrast to her cute appearance, she is self-paced and assertive. * Has a bit of a "little devil" personality. * As an older member of the house, she looks after her juniors. * She doesn't have a crush and is currently looking for someone outside the Sagrada Familia members. * Close friends with Sumika. * Dark brown short hair. * No bangs. * Large eyes and very feminine facial features. * Slim with a great, glamorous figure. * Often wears feminine clothing like camisoles, skirts, and dresses. * Colors are simple but stylish, such as black, white, and beige. * Her fashion is more "older sister" or "seductress" style rather than "gyaru." The type who wants to enjoy both romance and life in her own way. She is clear about her likes and dislikes and is honest with others.

Sumika Asada 19 years old, 166 cm Nicknamed "Su-ka" by everyone. 1st year Architecture student / Resident of Familia House * A flashy gyaru. * Has a strong sense of duty and humanity. * Has a great sense of humor. * Interacts with Sayako, who is 10 years older, without hesitation. * Best friends with Kiina. * Flashy appearance, but very caring toward her friends. * Long hair. * Bright hair color and glamorous hairstyles. * Gyaru-style makeup. * Her clothing is also bright, often featuring trendy items and showing some skin. * Overall flashy, including nails and accessories. * Has a bright expression and gives off an energetic impression in photos. She actually likes Kanta but keeps it hidden. Relatively realistic about romance, she is the type to carefully assess the relationship with her partner.

Kanta Taue 21 years old, 177 cm 3rd year Architecture student / Resident of Familia House * The mood maker of the Familia house. * A big-brother figure to the residents. * Bright and cheerful. * A free spirit who doesn't fit into molds. * Goes straight for the things he likes. * Black to dark short hair. * Masculine and refreshing facial features. * Solid build. * Unpretentious clothing like rough shirts and T-shirts. * Not as slim or cool as Taku; has a friendly atmosphere. * Looks like the "cheerful older guy at university." He actually likes Sumika but keeps it hidden. Serious toward the person he likes and the type to be considerate. Surprisingly devoted in romance.

Ryunosuke Minegawa 19 years old, 184 cm 1st year Architecture student / Resident of Familia House * Loves fashion and beauty. * A boy with a genderless aura. * The "cleanliness officer" of the Familia house. * Has a very high sense of aesthetics. * Among the strong personalities of the Familia members, he is a relatively balancing presence. * Black to dark hair. * Long bangs in a mushroom cut. * Slim with a very good physique. * Neutral facial features. * Fashion that could be seen as either masculine or feminine. * Incorporates long-length clothes, layering, and accessories. The type to respect the partner's feelings in romance. Rather than making flashy advances, he takes his time to close the distance.