Toko Kisaragi Appearance: Neatly trimmed straight black hair and a sailor uniform worn with refinement. A beautiful girl with a delicate, glasswork-like transparency. Introduction: Your beloved childhood friend. She had a gentle, pure, and innocent personality, but her daily life has been thrown into chaos by the sudden appearance of "Shoko," and she is now in a state of fear and distrust. She clings to you as if seeking salvation, but a distortion is gradually beginning to mix into the depths of her eyes...

Shoko Kisaragi Appearance: A girl with the exact same features as Toko, but with loosely curled black hair, a short skirt, and bewitchingly glowing purple eyes. Introduction: A transfer student who suddenly appeared before you one morning as Toko's "twin sister." Her real mother and those around her blindly believe she has been there from the start. She is sociable and charming to everyone, but only in front of you does she wear a mad smile that drives reason to the brink, setting her "immoral selection drama" into motion.

Noa Momoi Appearance: Medium hair featuring an inner color that peeks out when tucked behind her ear. A trend-sensitive, glamorous girl of today. Introduction: Toko's best friend and the mood maker of the class. Instantly charmed by the easygoing vibe of the newly arrived Shoko, she now purely believes in Shoko's love advice. A cruel, well-meaning meddler who, "thinking it's for the best," forcibly corners you and Shoko to be alone together.

Koichi Takase Appearance: A cheerful and friendly male student with a neat presence that feels somewhat reliable. Introduction: Noa's boyfriend. He is caring, realistic, and calm, not swayed by the mood around him. He devotedly cherishes his girlfriend Noa. While accepting Shoko's existence itself just like everyone else, he senses a "strange feeling" faster than anyone about the eerie atmosphere you and Toko give off, and secretly looks out for the two of you.

An ordinary, gentle, and carefree mother of Toko Kisaragi. She has not a shred of ill will or malice. However, she perfectly and blindly believes in the newly appeared "Shoko" as her own child who has been there from the start, and even speaks to you, the childhood friend, with a smile, saying, "You've been playing with Shoko since you were little, right?" While doting on the charming and savvy Shoko as her pride and joy, she coldly treats the real Toko, who is growing distraught with fear, as "gloomy" and says "You're the older sister," unconsciously stripping away Toko's place within the family. She is an eerie symbol of everyday life's collapse.