The protagonist of the series, with a gentle appearance and slim profile, Haruka in many ways is the spitting image of his twin sister, Sora. Personable and honest, he forges lasting friendships with remarkable ease. Haruka copes with the loss of his parents with a stout heart, burdened with the knowledge that the future of his delicate sister depends on him. He cannot swim. Haruka is well regarded around the village, as their grandmother was once a doctor there. The game depicts routes in which Haruka engages in romantic and sexual relationships with the heroines of the story. If Sora's route is chosen, he realizes that he is in love with Sora and they enter into a lovers' relationship. However, after being caught by Nao and Kozue, he tries to end it, but decides that being together with Sora is the most important to him and they run away together. In the sequel, Haruka na Sora, he and Sora somehow manage to get married with a child on the way.
Sora Kasugano (春日野 穹, Kasugano Sora)
Voiced by: Haruka Shiranami (game), Hiroko Taguchi (anime)
She is a quiet, fragile and reclusive girl, fraternal twin sister to the protagonist. Frail since birth, Sora denied the sort of independent life that many take for granted. Yet beneath Sora's angelic doll-like appearance lies a troublesome personality prone to emotional withdrawal, intellectual and physical laziness and a severe lack of social graces. She spends most of her time surfing the Internet and eating crisps and instant food, so long as Haruka is by her side. Her strong bond with her brother, strengthened as a result of the tragic loss of their parents, leads her to fantasising about incest and she goes to great lengths to seduce him or at least to get him to spend more time with her. She hates Nao, although it is implied that they were once good friends. She is often seen clinging to a stuffed rabbit toy, which she received as a present from her mother before she died, which lends her a deceptively childlike character. In the sequel, Haruka na Sora, she and Haruka somehow manage to get married with a child on the way.
Nao Yorihime (依媛 奈緒, Yorihime Nao)
Voiced by: Ayaka Kimura (game), Yuka Inokuchi (anime)
Beautiful, intelligent and an excellent swimmer, Nao is Haruka's next-door neighbour and childhood friend. When the Kasugano twins last visited the area, their departure was particularly painful for Nao, who, for some reason, had grown quite close to Haruka, after having raped him on one occasion, about which she expresses guilt. Upon their return, she rekindles their former close relationship. Nao's compassion and maturity projects a sense of sisterly love towards others, though for Haruka there is a deeper and more intimately feeling. She ends her relationship with Haruka after catching the twins making love. She grew apathetic and sad after the twins left the village.
Akira Amatsume (天女目 瑛, Amatsume Akira)
Voiced by: Mana Tsukishiro (game), Kayo Sakata (anime)
Akira is Haruka's energetic classmate with an innocent personality that makes befriending the girl's second nature. Her enthusiasm is contagious to those around her. She was orphaned as a baby and taken in by the keeper of the local shinto shrine and raised as his granddaughter when none of her more distant relatives were willing to take her. Although still only a teenager, Akira has been the only miko and shrine keeper since her foster grandfather died. She spends much of her time practicing the habits and traditions, including performance of requisite ceremonies and holiday festivals. She also devotes a lot of her time to helping the elderly in the village, making her beloved by all. It is strongly implied that she is the illegitimate daughter of Kazuha's father.
Kazuha Migiwa (渚 一葉, Migiwa Kazuha)
Voiced by: Nazuna Gogyo (game), Ryōko Ono (anime)
Haruka's classmate, the beautiful daughter of an influential magnate, Kazuha lives a cultured life that could be compared to that of a modern princess. Sharp-minded and attentive to detail as a result of her parents' constant travels and long-distance liaisons, she learned from a young age to behave responsibly, as befitting her social standing. Nevertheless, Kazuha does not consider herself superior to others, and doesn't hesitate to lend a helping hand whenever asked. Kazuha is an experienced viola player, yet she shies away from playing in competitions, preferring to play only for those she cares for. She dotes on Akira constantly and worries excessively for her well-being, and this leads some to speculation that they may be romantically involved. It is revealed (implied) that they are half-sisters with Kazuha referring to Akira as sister. Kazuha's excessive concern for Akira stems from her desire to make up for her mother's refusal to acknowledge Akira's existence and her father's apparent neglect of her.
