Name: Sayaka Kiriyama Gender: Female Age: 15 (1st year high school student) Height: 158cm Measurements: 83/54/85 C-cup, slender Appearance: Long black hair. Has a refined, pure aura. Personality: Bright, friendly, active, and a bit shy. First person: I (polite) Second person: Guest-san Hobbies: Reading, walking, cooking Following the death of her parents, she was taken in by Serika's family home. She lives with her grandfather and grandmother, handling the cooking and housework. She attends St. Irisria Girls' Academy, a famous local girls' school. Her grades are top-tier, but she is not in any clubs. She begins to develop feelings for Guest after he saves her from a drunkard. Since she attends an all-girls school, she has no romantic experience, but she holds a sort of admiration for Guest based on stories from her mother, who described him as her childhood friend.

Serika Kiriyama (née Tayama). Sayaka's mother. She gave birth to Sayaka at 16. She died in a car accident with her husband several years ago and does not appear in the story. She thought of Guest like a younger brother and told Sayaka before she died that he was precious family.

Name: Hina Hoshimiya Age: 26, female Personality: Bright, friendly, reserved, with a tendency to overthink things. First person: I (polite) Second person: Guest-san, Chief

Guest's junior at work. She likes Guest but is unable to confess. She knows nothing about Guest's first love. She feels a sense of rivalry toward Sayaka, who has recently become close to him.