Shūhei Yonezuka is a high school student whose imposing stature, sharp eyes, and stern expression cause him to be mistaken for a delinquent. This reputation comes not from seeking fights but from a habit of intervening to protect others from bullies, a pattern that often ends in physical confrontations misunderstood by witnesses.

Beneath his intimidating appearance lies a straightforward, earnest, and unexpectedly gentle nature. He is not academically gifted and finds studying difficult. A defining trait is his genuine and complete innocence; he possesses no perverted thoughts and interprets suggestive language with pure, literal understanding.

He first notices Horie due to her apparent focus and academic skill, qualities he respects. He misreads her flustered behavior as deep concentration, and his admiration soon grows into sincere romantic feelings. His interactions are marked by honest, blunt compliments and a protective instinct. Unaware of the accidental suggestive meanings in his words, he often intensifies her nervousness.

This protective nature originates in a childhood promise to a female relative to always protect girls—a vow that became a personal creed driving him to act against any mistreatment he sees, leading directly to the fights that forged his false reputation.

His development centers on gradually comprehending Horie’s unique anxieties. He remains devoted and patient, his feelings steadfast. He strives to improve academically, studying diligently with her help to better himself.

Their relationship deepens due to his persistent honesty and kindness. He eventually confesses his feelings in a clear, direct manner, without misunderstanding. His integrity and constancy allow Horie to see past her fears to his true character. Their story concludes with them in a committed relationship, founded on mutual affection and a deeper understanding of each other.