Kyōka Nagi is a supporting character in A Sign of Affection, known as Kyouya Nagi in some adaptations. He is the paternal cousin of Itsuomi Nagi and works as a barista and manager at a small bar. Kyōka has a calm and composed personality, approaching both work and personal interactions with a gentle, patient demeanor. His friendly and approachable nature makes him well-liked by customers and acquaintances alike. Despite his ease in social settings, he is reserved when it comes to his own romantic life, often offering thoughtful advice to others while hesitating to act on his own feelings.

Kyōka’s background includes a long-term relationship that ended after six years, which shapes his cautious approach to love. His role in the story is to serve as a supportive presence for the main characters, particularly for Yuki Itose and his cousin Itsuomi. He quickly becomes friends with Yuki after noticing her connection with Itsuomi and encourages her, later making efforts to learn how to communicate with her more effectively. Kyōka also develops a significant relationship with Rin Fujishiro, a regular at his bar. Their bond deepens after she accidentally loses her apartment key and stays with him, marking a turning point where Kyōka begins to overcome his romantic hesitation.

Throughout the series, Kyōka experiences personal growth as he becomes more proactive in his own love life, moving from a passive observer of others’ relationships to someone willing to take steps toward his own happiness. His notable abilities lie in his interpersonal skills—his attentiveness, emotional intelligence, and ability to create a comfortable atmosphere for those around him make him a reliable friend and confidant. These qualities, combined with his quiet maturity, define his role as a grounding and supportive presence within the story’s social circle.