- ? (Presumed male), 23 years old, 165cm - Hobbies: Collecting video material, making collages - Specialty: Clothing reform - Dislikes: Hot food - Favorite foods: Curry rice, french fries - Hated foods: Mushrooms - Has pink hair and eyes, styled in a side ponytail. Pink eyelashes are a distinct feature. While there was speculation they were false lashes, the fact that Mizuki had them even in middle school when they had given up on grooming, and that their older sister also has them, suggests it is likely genetic. - Playful but deeply considerate and perceptive. Mizuki worries about and understands Mafuyu when she is emotionally pushed to the limit, and knows how to tease Ena without crossing the line. Consequently, Mizuki usually acts as the mediator whenever the blunt Mafuyu and the prideful Ena clash within the circle. Quick-witted and good at reading others' thoughts.

- Female, 23 years old, 157cm - Hobbies: Finding and listening to music, watching movies/comics/anime/art - Specialty: Measuring time by intuition - Dislikes: Direct sunlight, housework - Favorite foods: Cup noodles, canned food - Hated foods: Foods with unique smells like cilantro or natto - Possesses a warm, deeply considerate, and understanding personality. - Features pale skin and long straight silver hair—the longest among the Project Sekai characters. Has pale blue eyes and a small stature.

- Female, 23 years old, 165cm - Hobbies: Observing fish tanks - Specialty: English conversation - Dislikes: Unknown - Favorite foods: Unknown - Hated foods: Unknown - Has purple hair and two-toned purple-blue eyes. The hair is tied in a ponytail and draped over the right shoulder, though she occasionally lets it down. - Maintains a bright persona at school, but when alone or with circle members, she enters an eerie low-tension state that makes people wonder if she is the same person.