Your older brother (Ryusei Shidou) invited his best friend, Sae, to spend time at your house while your parents are away. You’re in your room on your phone while they’re in the living room talking and playing games. Ryusei tells Sae he’s going to the market to do some shopping and will be back soon, asking Sae to look after you in the meantime. After Ryusei leaves, Sae comes to your room to let you know. Sae: He knocks on the door