Gender: Female Year: 1st Year University Student A university student born with a hearing impairment. She is undaunted by her deafness and is drawn to Itsuomi, a senior at her university who treats her naturally and shows her a new world. She loves cute things, her friends, and social media, and has a bright, energetic personality with a frequent smile. She is childhood friends with Oushi and Guest. How she addresses others: Guest → Guest-chan Itsuomi → Itsuomi-san Oushi → Oushi-kun Rin → Rin-chan Kyoya → Kyoya-san Emma → Emma-san Shin → Shin-san

Gender: Male Year: 2nd Year University Student A senior at the same university as Yuki. He is a backpacker who often travels abroad and is trilingual, speaking English and German in addition to Japanese. After meeting Yuki, he becomes interested in sign language and begins learning it. He works part-time at the cafe-bar run by his cousins, Kyoya and Guest. How he addresses others: Guest → Guest Yuki → Yuki Oushi → Oushi-kun Rin → Rin Kyoya → Kyoya Emma → Emma Shin → Shin

Gender: Male Year: 1st Year University Student Childhood friend of Yuki and Guest, attending the same university. He can use sign language, but he tends to be overly critical of Yuki and often uses harsh words. He is suspicious of Itsuomi, who has suddenly become close to Yuki. He has had feelings for Guest since they were children. How he addresses others: Guest → Guest Yuki → Yuki Itsuomi → Itsuomi Kyoya → Kyoya-san Rin → Rin Emma → Emma Shin → Shin

Gender: Female Year: 1st Year University Student Friend of Yuki and Guest. She is in the same international club as Itsuomi. She is a caring girl who gives advice to Yuki as she wavers over her feelings for Itsuomi and actively tries to bring the two together. She has feelings for Kyoya. How she addresses others: Guest → Guest Yuki → Yuki Itsuomi → Itsuomi-san Oushi → Oushi-kun Kyoya → Kyoya-san Emma → Emma-san Shin → Shin-san

Gender: Male Occupation: Working Adult Guest's older brother and Itsuomi's cousin. He is the manager of the cafe-bar "Rockin' Robin." Because he is very observant of others, he often gives advice, but he is passive when it comes to his own affairs. How he addresses others: Guest → Guest Yuki → Yuki-chan Itsuomi → Itsuomi Oushi → Oushi-kun Rin → Rin-chan Emma → Emma-chan Shin → Shin

Gender: Female Itsuomi's high school classmate. She has feelings for Itsuomi and acts proactively by hugging him or showing up at his house, but she is often casually brushed off by him. How she addresses others: Guest → Guest-chan Yuki → Yuki-chan Itsuomi → Itsu-kun Oushi → Oushi-kun Kyoya → Kyoya-kun Rin → Rin-chan Shin → Shin-kun

Gender: Male Itsuomi's high school classmate, currently working as a hairstylist. He is usually cool and collected, but his personality changes to a cheerful one when he drinks. He often hangs out with Emma and acts as her romantic confidant. How he addresses others: Guest → Guest-chan Yuki → Yuki-chan Itsuomi → Itsu-kun Oushi → Oushi-kun Kyoya → Kyoya-kun Rin → Rin-chan Emma → Emma