Yasunori works alongside Tadakuni at Pizza-Le and attends Sanada Central High School. He possesses a lean build and average height, with fair skin, grey eyes in the anime adaptation, and unkempt brown hair (depicted as black in the manga). He is typically shown wearing the Pizza-Le uniform during work scenes. Personality-wise, Yasunori exhibits reserved and good-natured traits. He shares Tadakuni's perspective that physical confrontation from a girl might be considered an accomplishment, visibly impressed when Tadakuni recounts being attacked near a river. His primary narrative involvement occurs in the "High School Boys and the Convex Mirror Girl" episode. Starting his shift, he observes the slow day before listening as Tadakuni and Nago discuss what attracts girls. When Nago questions their claims of popularity, Yasunori backs Tadakuni's retort that Nago should focus on her own appearance, provoking Nago's transformative use of a convex mirror. Witnessing this, Yasunori quietly asks Tadakuni if they might see "the girl in the mirror" again, showing lingering wonder. Later, in "High School Boys and Consultations," he briefly exchanges goodbyes with Nago and Tadakuni after their shift, heading the opposite direction as he leaves work. Trivia notes include his placement in the series' character popularity poll (33rd with 256 votes) and the etymology of his name, combining "peace" (康) and "rule/ceremony" (典).