Kyouichi Kanzaki is a high school student and one of the central figures in the anime. He is characterized by a gentle, kind, and introverted nature, often described as a nice guy who is thoughtful and sensitive but lacks confidence in social situations, especially when it comes to romance. Unlike his more outspoken friends, Kyouichi is soft-spoken and moody, displaying little interest in sports and preferring a quieter, more artistic lifestyle. His primary passion is art, and he is an aspiring artist who spends much of his time sketching and observing the world around him.

Kyouichi's main motivation throughout the story revolves around his difficulty in expressing his deep-seated romantic feelings for his childhood friend, Chiharu Nitta. He is a shy individual who struggles to communicate his emotions, often finding himself hesitant and unable to confess his love directly, which leads to much of the turbulence in their relationship. His personal journey is largely about overcoming his fear of vulnerability and learning to open himself up to the world and to his own feelings.

In the narrative, Kyouichi serves as the de facto main protagonist, with the story beginning and ending from his perspective and his relationship with Chiharu forming the core, ongoing plotline around which other episodic stories revolve. His role is that of an everyday teenage boy navigating the uncertainties of first love, often acting as a narrator who provides philosophical and poetic reflections that set the tone for each episode. The series focuses on his struggles with adolescence, including his insecurities and his attempts to understand his own heart.

The most significant relationship in Kyouichi's life is with Chiharu Nitta, a talented track athlete who is also his childhood friend. Their relationship is central to the story, marked by a mutual but unspoken affection that is constantly hindered by miscommunication and external misunderstandings. A major point of conflict occurs when Kyouichi witnesses Chiharu kiss another boy named Yuki, which creates a painful rift between them. During this period of estrangement, he briefly connects with another girl, Shoko Sayama, which further complicates his feelings. Beyond his romantic interests, Kyouichi is part of a close trio of male friends including the data-collecting Makoto and the athletic Yoshihiko, whose contrasting personalities help to highlight Kyouichi's own quiet and introspective character. A pivotal encounter occurs on a trip to Hokkaido, where he meets a confident, half-Finnish girl also named Chiharu, a wood-carving artist who guides him on a motorcycle. This meeting is crucial for his development, as her honest critique and carefree spirit force him to confront his own fears.

Kyouichi undergoes notable development throughout the series, evolving from a boy who hides from emotional pain and views the world from a safe distance to someone willing to embrace its messiness. A key turning point occurs in Hokkaido, where he realizes that his sketches feel forced because he has been trying to confine a vast world into a tiny frame, a reflection of his own tendency to keep people at arm's length to avoid getting hurt. This revelation allows him to understand Chiharu's perspective better and gives him the courage to return home with the intention of setting things right between them. His character arc is about the transition from running away into a small, controlled world to opening himself up to the full, unpredictable experience of life and love. Aside from his artistic talent, Kyouichi possesses no flashy or extraordinary abilities. His notable traits are his emotional resilience and his capacity for introspection, which ultimately become the tools for his personal growth and his ability to see the beauty in the world around him.