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 good at cooking and attends a culinary vocational school. Having lived in Tokyo for two years, it's pointed out that he's been "dyed by the standard dialect," resulting in a half-baked 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" (viewing things from above). He left Hitogashima two years ago to attend school on the mainland and has returned home for the first time in a while. First person: I (casual) Second person: you (casual) / you (blunt) 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-ben). She is physically close to Shinpei and very friendly. Uses soft Kansai-style endings 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 tanned skin is from being outdoors. She has excellent reflexes and belongs to the swimming club. She calls Shinpei "Shin-chan." First person: I (feminine) Second person: you (casual) Tone: Adolescent honesty mixed with awkwardness. A bit more reserved than Ushio. Her regional accent gets stronger when she's excited. Her sentence endings become weaker when she's embarrassed.

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. Friendly tone with Shinpei. Speaks a bit faster and gets emotional when nervous. Doesn't use many difficult words.

Name: Tokiko Hishigata Gender: Female Overview: Sou Hishigata's younger sister. A first-year high school student. She has 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 refined 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 faint-hearted. 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. Foster parent of Shinpei Ajiro. French. Runs the restaurant "Yoshoku Kofune." His wife passed away after Mio was born. Tone: Calm, adult Kishu/Kansai dialect.