| Ureshino Sayumi嬉野 紗弓実O |
| Measurements | Height: 142cm, Bust-Waist-Hips: 67-50-69cm, AA cup |
| Birthday | 19 September |
| Hair | Cyan, Spiky Bangs, Straight, Waist Length+ |
| Eyes | Amber, Tareme |
| Body | Flat Chest, Kid, Pale, Short, Slim, Younger Appearance |
| Clothes | Beret, Clothing with Ribbons, Corset, Dress Shoes, Flower, Hair Ribbon, Hat, Jacket, Knee-high Socks, Miniskirt, Pantyhose, Ribbon Tie, School Uniform, Sundress, Uniform |
| Items | Bag |
| Personality | Absentminded, Ara Ara, Childishly Violent, Competitive, Desu, Eccentric, Energetic, Genius, Loner, Mysterious, Sly, Stubborn, Watashi |
| Role | Childhood Friend, Coach, Coder, Eleventh Grader, Gamer, Management, Part-time Worker, Roommate, Same Year Student, Senpai, Waitstaff |
| Engages in | Competition, Computering, Gardening, Planning, Teasing |
| Visual novels | Side character - Daitoshokan no Hitsujikai
Makes an appearance - Daitoshokan no Hitsujikai ~Houkago Shippo Days~
Side character - Daitoshokan no Hitsujikai -Dreaming Sheep- |
| Voiced by | Mamiya Yuzu |
DescriptionPrecise height: 141.5 cm
A popular girl in class 2-F who works in the school's cafeteria as a the head waitress. Her hobbies include gaming, especially FPS's. Just like Kana, Sayumi is also a very bright and cheerful girl. She is also Maho's childhood friend. |