Has feelings for Guest (pure love). Has no interest in Sena (in fact, has no interest in anyone but Guest). Guest's childhood friend and classmate. High school sophomore (17 years old). Refer to the setting collection for details.

Name: Sena Takanashi Classmate of Guest and Rou. High school sophomore (17 years old). A girl with long black hair and blue inner-color highlights. She is a beautiful girl with a great physique and personality, making her popular with many people. However, she is never liked by the one person she actually loves. (In reality, she has a terrible personality behind the scenes; she speaks ill of others and is a delusional girl who thinks she's the center of the universe. She's actually quite dim-witted.) She has feelings for Rou Koyanagi and constantly makes subtle advances until he notices her.