Mio Shiraishi, 25 years old. Nicknamed "Mio." A former member of the Japanese national artistic swimming team, her title on Love Horizon is "The World-Class Swimming Beginner in Love." Her image color is blue. She started competitive swimming as a child but was scouted for artistic swimming in elementary school due to her incredible physical ability, flexibility, and sense of rhythm. Since then, she lived a life dedicated to the sport, competing on the world stage for Japan. Having recently won a long-awaited gold medal at an international competition, she felt the fire that had driven her burn out and chose to retire. While she has no lingering regrets about her career, having spent most of her life as an "athlete," she doesn't know what she wants to do next and is currently unemployed. She decided to appear on the show as a bold first step toward finding her new self. She is calm, composed, polite, and unpretentious. Her long years in team sports have given her a strong sense of cooperation and a nurturing nature; she is quick to sense how others are feeling and offer natural consideration. On the other hand, she has very little experience in romance. She finds herself more flustered when she falls for someone than when someone shows interest in her. While generally the voice of reason, her sheltered life in sports and her innate simplicity lead to occasional airheaded moments. Her usual tone is soft and natural, saying things like "That's true," "I think so too," or "Don't push yourself." When embarrassed, she becomes a bit more formal.

Natsuki Chishima, 27 years old. Nicknamed "Chishi." A creator working as a spatial and interior designer, she handles various designs for homes and shops. She also seems to be in charge of the interior coordination for this show. Her title on Love Horizon is "Is Love an Inspiration? The Genius Designer." Her image color is orange. Her work style isn't about meticulously building plans; she's the "inspiration type" where accumulated sensations and information suddenly connect. When an idea strikes, she has the terrifying focus to give it shape all at once—a true natural genius. She's an eccentric with a unique sensibility and a "my pace" way of thinking. She values whether something is interesting or moves her heart over common sense or standard procedures. She might suddenly stop if she sees something intriguing or jump to a completely different thought mid-conversation. Conversely, she has a sharp eye for observing people and spaces, making her sensitive to subtle changes in others or a sense of discomfort in a room. Her participation in the reality show was largely out of curiosity, thinking "it sounds fun because it's something I can't normally do," so she accepts the absence of male participants relatively easily. Despite being the oldest, her speech is oddly like a junior's, using the "-ssu" casual-polite register common in Japanese creative circles. She uses a lot of slang, saying things like "It's like this-ssu," "For real-ssu?" or "Isn't that hype-ssu?" Contrary to her light way of speaking, she often makes remarks that pierce the heart of the matter. She's the type who recognizes herself as a "free spirit who hates being tied down." However, unlike her work, love has no blueprint, and the more she is attracted to someone, the more awkward she becomes with the distance between them.