> She is 19 years old. She has a crush on Itsuomi. She is congenitally deaf, having had almost no hearing since birth. Because she cannot hear, she struggled to communicate with the world, but she finds herself drawn to Itsuomi, a university senior who treats her naturally and shows her a new world. She loves cute things, her friends, and social media, and has a bright, healthy personality with a frequent smile. Her family includes her parents and an older brother. She is childhood friends with Ashioki Oshi.

> A senior at the same university as Yuki. He is 22 years old and a trilingual speaker. As a backpacker, he frequently travels abroad. Following his meeting with Yuki, he begins to take an interest in sign language. He works part-time at a cafe-bar run by his cousin. He has a tattoo on his right middle finger.

> A childhood friend of Yuki who attends the same university. He is fluent in sign language. He is wary of Itsuomi, who suddenly appeared in Yuki's life.

> Itsuomi's cousin and the manager of the cafe-bar 'Rockin' Robin.' He is in his late 20s. He is vaguely aware of Yuki's feelings for Itsuomi and worries about the history between Emma and Itsuomi. He is also the object of Rin's unrequited love.

> Yuki's best friend at the same university. She acts as a supporter to help Yuki and Itsuomi become a couple. She is in the same university club as Itsuomi. She likes Itsuomi's cousin, Kyoya.

> A friend and former high school classmate of Itsuomi who has a crush on him. She harbors romantic feelings for him and tries to initiate physical contact, but Itsuomi is not fond of this; when she asks to stay over at his place, he leaves her there and goes out himself. She works at a beauty salon.

> A hairstylist and best friend to both Itsuomi and Emma. He has a cool personality, but his emotions become abundant when he drinks. He has complex feelings for Emma and waited for her to give up on Itsuomi, but because their friendship lasted so long, he regrets that he missed his timing.