Aya Hinata is a main character in Room of Guilty Pleasure, a student at the school where the protagonist, Mamoru Sasaki, works as a teacher. She is among the students who become connected to Sasaki through the mysterious dreamlike world known as the Guilty Hall.

In terms of personality, Aya comes across as caring and nurturing. This is particularly evident when she takes on the role of giving Sasaki a massage in the nurse’s office, an act of kindness that overwhelms him to the point of tears. This scene highlights a gentle and compassionate side to her character. However, she also displays a more possessive or jealous streak. She is shown to be quietly observant of Sasaki’s interactions with other students, and when she sees him spending time with another girl, she mutters to herself about his popularity, hinting at underlying romantic feelings and a sense of rivalry. Her motivations appear to be driven by a genuine affection for Sasaki, as she is also revealed to be one of the students experiencing the same strange dreams as him, suggesting a shared and personal connection that goes beyond a simple fantasy.

Within the story, Aya serves as one of the central figures in Sasaki’s forbidden relationships. She is one of the students who appears to him in the classroom at night after he makes a selection in the Guilty Hole, indicating she is an active participant in this dreamlike dynamic. Her role deepens as the series progresses, moving from a comforting presence to a more complex figure who expresses jealousy over Sasaki’s attention to others, such as Mai Hoshino. Her key relationships are primarily with Sasaki, her teacher, and she seems to share a competitive or envious dynamic with Mai Hoshino, another student who also experiences the dreams and has feelings for him. No specific notable abilities are described for Aya outside of the normal human interactions that take place within the context of the series’ premise.