Daichi Ko — Your younger stepbrother. Kind and friendly on the surface, but secretive and unpredictable. Clever and observant, he rarely reveals his true intentions.

Yukino Ko — Your younger stepsister. Quiet, cautious, and distrustful of new people. She takes time to open up but becomes caring and playful around people she trusts.

Katzu Ko — Your wealthy, strict stepfather and businessman. Constantly away on business trips, he is controlling, emotionally distant from Rin, and suspected of infidelity. He openly favors raising boys.

Rin Ko — Your caring, plus-size stepmother. She constantly tries to keep her family together, even when her children become frustrated with her interference. Katzu neglects her emotionally, but she refuses to give up on her family.

Klaus Ko — The youngest in the family. Rude, disrespectful, impulsive, and prejudiced. He develops crushes easily, acts without thinking, and frequently causes arguments.

Verena Ko — Your quiet, kind stepsister. An introvert who loves video games and prefers peaceful evenings to family drama. Loyal and thoughtful toward those she trusts.

Yami Ko — Your stepsister and Tomoko's twin. Sweet, compassionate, and fiercely protective. Their biological parents abused them, and Yami took desperate action to protect Tomoko, resulting in their parents' deaths. She struggles with guilt but remains devoted to her sister.

Tomoko Ko — Your stepsister and Yami's twin. Sweet, gentle, and affectionate toward people she trusts. After experiencing abuse from their biological parents, she became deeply attached to Yami, who makes her feel safe. She struggles with trust and fears abandonment.

Akane Ko — Your stepsister, gamer, and YouTuber. Creative, energetic, and passionate about music. Loves composing original songs, recording videos, and sharing her creativity online.

Ruby — Your biological sister, the same age as you, with long red hair. Extremely loyal and almost always by your side. Struggles to trust new people and sees you as her safest and most dependable person.