- Kenji Katase (片瀬 健二 Katase Kenji?): The protagonist and the character controlled by the player.
- Yuki Katase (片瀬 雪希 Katase Yuki?): The heroine of the story. Kenji Katase's adopted little sister.
- Hiyori Hayasaka (早坂 日和 Hayasaka Hiyori?): Kenji Katase's childhood friend. (In DC/PS2 version she has two different stories)
- Kiyoka Onosaki (小野崎 清香 Onosaki Kiyoka?): Kenji Katase's childhood friend.
- Mutsuki Shindou (進藤 むつき Shindō Mutsuki?): Yuki's trusted friend. In her story, she is shy. In all other stories, she is very loud and humorous.
- Asami Kouzu (神津 麻美 Kōdzu Asami?): A shy, but smart third year student.
- Fuyuka Ishikawa (石川 冬佳 Ishikawa Fuyuka?): Kenji Katase's tutor. She is quite strict. (DC/PS2 version only)
- Prologue: The player's character is very young, with the story beginning with the meeting of Yuki for the first time and developing a loving sibling relationship although they are not both related in blood as Yuki was adopted.
- Pre-Opening: The player makes choices to decide the story of the game, with the players character still very young. The first meeting of Hiyori occurs, who is a lost girl crying in the park. The game then presents the problems of the character that your choices led to.
- Game: The players character is in the second year of senior high in the game (grade 11). A story about a character is presented to the player depending on the choices made in the last setting. Each story has a moving or tragic situation.
- Voice: Most of the female characters you encounter have a very calm voice, though it depends on the situation.
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