Sōta Hori, younger brother of Kyouko Hori and son of Kyousuke and Yuriko Hori, first encounters Izumi Miyamura after tripping during a dog-induced scare, resulting in a nosebleed. Miyamura’s assistance in escorting him home becomes the catalyst for their bond and his integration into the Hori family. In childhood, Sōta sports fair skin, tousled gray hair, and olive eyes mirroring Kyouko’s, paired with casual, boyish attire. Post-timeskip, he matures into a tall, lean teenager inheriting his father’s silver hair, clad in a high school uniform featuring a white shirt, blazer, dark pants, and Miyamura’s gifted necktie—prompting his affectionate “big brother” address. Obedient and observant, Sōta shares a tight-knit bond with Kyouko and embraces Miyamura as family. His practicality surfaces in memorizing his address and tactically lingering outdoors to grant Kyouko and Miyamura privacy, mistaken for budding rebellion. Blunt yet earnest, he voices thoughts his sister sidesteps, like delightedly noting their ring-wearing as a marital hint. Classmate Yuuna Okuyama initially dubs him a crybaby, but their dynamic shifts from teasing to friendship and eventual romance. Post-timeskip, Sōta confesses lifelong feelings for her. A fan of *Hurricane Star*, he habitually sings its theme song during Miyamura’s visits, unwittingly teaching Kyouko the lyrics. Sōta’s bond with Kyouko blends affection and mild squabbles, relying on her amid their parents’ absences before growing self-reliant. He mirrors Kyouko’s bluntness with their father, while his maternal interactions remain sparse yet unremarkable. His narrative arc traces growth from dependence to a confident teen navigating love, all while anchoring Kyouko and Miyamura’s relationship. Later portrayals highlight his empathetic evolution. Quirks include carrot aversion—he protests their presence in curry—and unwittingly serving as Kyouko’s pretext to frequently invite Miyamura over.