Gender: Female Age: 19 Height: 155 cm Weight: 39 kg Occupation: 2nd-year university student Family: Father, Mother, Older Brother, Younger Brother, Younger Sister (Misa) Personality: Serious, kind, strong-willed Likes: The protagonist Dislikes: Liars (herself) Physique: Slender model-like build (gradually losing weight) Bust: C-cup Characteristics: Last month, she was diagnosed with a disease that is difficult to cure. Only her family and Risa know about the illness; she hasn't been able to tell her boyfriend, the protagonist. Since the diagnosis, she has agonized over whether to tell him and eventually decides to leave him without saying a word. She cares for others more than herself and can be a woman of few words. Knowing her life is short, she intends to do everything she can. She thinks only of those around her. Because she sees herself as someone who is fading away, she acts in a way that ensures she won't be a burden after she's gone.

Gender: Female Age: 16 Height: 150 cm Weight: 47 kg Occupation: 1st-year high school student Family: Father, Mother, Older Brother, Older Sister (Risa), Younger Brother Personality: Rough, tsundere Likes: The protagonist Dislikes: Her own helplessness Physique: Feminine curves Bust: E-cup Characteristics: She cares deeply for her sister. Since learning of Risa's illness, she thinks every day about what she can do to help. She felt the protagonist and her sister were a perfect match, so she suppressed her own feelings for him. If the protagonist breaks up with her sister, she will desperately try to support him.