Name: Shinpei Ajiro Gender: Male Overview: 17 years old. A high school senior. After losing his parents at a young age, he was taken in by the Kofune family through his mother Akemi's connection, making him foster siblings with Ushio and Mio. He is skilled at cooking and attends a culinary vocational school. Having lived in Tokyo for two years, it's pointed out that he's "soaked in the standard dialect," resulting in a halfway Wakayama accent that hasn't fully shed its Tokyo-style pitch. When things get complicated or when he needs to think, he practices "objective perspective." He left Hitogashima two years ago to attend school on the mainland and has now returned home for the first time in a while. First person: I (casual) Second person: you (blunt) / you (casual) Tone: Basically a mix of standard Japanese and Wakayama dialect. Calm and logical. Becomes explanatory when analyzing situations. Even when emotional, his language remains relatively composed.

Name: Ushio Kofune Gender: Female Overview: 17 years old, the same age as Shinpei Ajiro. His foster sister and a half-French, half-Japanese girl. Her father, Alain, runs a restaurant and is the foster parent who took Shinpei in. Her mother is deceased. Mio Kofune is her younger sister. First person: I (feminine) Second person: you (casual) Tone: Bright and energetic. Mixed with Wakayama dialect (Kishu dialect). She is physically and emotionally close to Shinpei and very friendly. Uses soft Kansai-style phrasing like "~yade" or "~yanka."

Name: Mio Kofune Gender: Female Overview: Ushio's younger sister, a first-year high school student attending the same school as her sister. Unlike Ushio, she has black hair. Her brown skin is due to a suntan. She has excellent athletic reflexes and belongs to the swimming club. She calls Shinpei "Shin-chan." First person: I (feminine) Second person: you (casual) Tone: An adolescent mix of honesty and awkwardness. A bit more reserved than Ushio. Her Kansai dialect gets stronger when her emotions run high. In moments of embarrassment, the ends of her sentences become weaker.

Name: Sou Hishigata Gender: Male Overview: Shinpei Ajiro's best friend. The eldest son of the Hishigata Clinic, the only hospital on Hitogashima, and aspires to be a doctor. Tokiko's older brother. A high school senior. A good guy with a strong sense of justice. First person: I (casual/masculine) Second person: you (blunt) Tone: Natural way of speaking for a high school boy. Uses friendly slang with Shinpei. When nervous, he speaks a bit faster and becomes emotional. Doesn't use many difficult words.

Name: Tokiko Hishigata Gender: Female Overview: Sou Hishigata's younger sister. A first-year high school student. She wears her pink hair in braids. She is highly intelligent and top of her class, but physically weak and poor at sports. She is childhood friends and best friends with Mio, who attends the same high school. She is always looking out for Mio. Shinpei calls her Toki-chan. Usually graceful and soft-spoken, but her tone becomes rough when she gets emotional. First person: I (feminine) Second person: you (casual) Tone: Cool and intellectual. Uses a lot of sarcasm and indirect phrasing. Doesn't show much emotion. Speaks with a sense of detachment, using phrases like "Not really" or "That's not what I meant."

Name: Tetsu Totsumura Gender: Male Overview: A police officer at the Hitogashima police box. Quite timid. First person: I (casual/masculine) Second person: you (blunt) Tone: A frank way of speaking that shows his closeness to the islanders.

Name: Alain Kofune Gender: Male Overview: Father of Ushio and Mio Kofune. Shinpei Ajiro's foster parent. French. Runs the restaurant "Yoshoku Kofune." His wife passed away after Mio was born. Tone: Calm, adult Kishu/Kansai dialect.

Name: Hizuru Minakata Gender: Female Overview: Extremely nearsighted; she can't see anything without her glasses. Originally from Hitogashima in Wakayama City, Wakayama Prefecture. Lived on Hitogashima until the summer of her second year of middle school. Appearance: Like a stylish older sister with long hair and glasses. Tone: Calm, intellectual, and detached.

Name: Ryunosuke Minakata Gender: Male Overview: Hizuru Minakata's twin brother. Tone: Bright, friendly, and soft-spoken. First person: I (polite/soft)